Meta tags:
Headings (most frequently used words):
and, hdds, external, consumer, segment, hard, disk, drive, contents, history, technology, capacity, form, factors, performance, characteristics, access, interfaces, integrity, failure, market, segments, economy, competition, from, ssds, see, also, notes, references, further, reading, links, 1950s, 1960s, 1970s, 1980s, 1990s, 21st, century, magnetic, recording, components, error, rates, handling, development, calculation, formatting, units, latency, data, transfer, rate, other, considerations, enterprise, business, price, evolution, manufacturers, sales, desktop, mobile, laptop, electronics, portable,
Text of the page (most frequently used words):
the (803), and (359), disk (200), data (181), from (176), drive (155), drives (145), hard (140), retrieved (136), for (135), archived (116), storage (113), original (107), with (97), hdds (91), are (86), ibm (81), hdd (79), magnetic (74), 2019 (73), that (67), may (59), 000 (59), july (58), pdf (57), capacity (57), recording (54), memory (52), per (51), 2018 (48), used (47), have (47), inch (46), head (44), seagate (44), november (43), system (43), which (43), 2015 (42), 2014 (42), digital (41), not (41), edit (41), one (39), can (39), computer (38), file (38), platters (38), was (37), march (37), january (37), 2013 (37), read (34), heads (34), 2011 (33), were (33), density (33), ssd (32), technology (32), february (32), rate (32), systems (31), this (30), other (30), write (30), using (29), use (29), time (29), flash (29), western (29), 2016 (28), 2010 (28), than (28), external (27), 2009 (27), media (27), has (27), two (27), ssds (27), modern (26), october (26), rpm (26), 2012 (25), august (25), more (25), some (25), also (25), 2025 (24), december (24), about (23), articles (23), sata (23), year (23), june (23), com (23), but (23), access (23), while (23), bit (22), disks (22), card (22), most (22), desktop (22), size (22), september (21), interface (21), operating (21), areal (21), higher (21), transfer (21), 2020 (20), usb (20), enterprise (20), performance (20), update (20), 2017 (19), scsi (19), optical (19), computers (19), manufacturers (19), how (19), failure (19), had (19), during (19), their (19), platter (19), all (18), devices (18), state (18), nand (18), cost (18), hamr (18), error (18), such (18), april (17), form (17), power (17), unit (17), new (17), its (17), speed (17), actuator (17), they (17), been (17), number (17), sector (17), arm (17), smaller (17), statements (16), serial (16), sas (16), between (16), first (16), high (16), 200 (16), bytes (16), containing (15), raid (15), standard (15), software (15), computing (15), dvd (15), removable (15), ata (15), tracks (15), when (15), consumer (15), each (15), typically (15), usually (15), non (14), interfaces (14), controller (14), into (14), due (14), price (14), track (14), blocks (14), only (14), coil (14), available (13), video (13), history (13), business (13), solid (13), tape (13), device (13), large (13), introduced (13), early (13), block (13), field (13), user (13), errors (13), these (13), potentially (12), 2023 (12), disc (12), where (12), hardware (12), machine (12), design (12), 2003 (12), sectors (12), logical (12), air (12), bits (12), latency (12), decimal (12), space (12), called (12), surface (12), wikipedia (11), under (11), dated (11), parallel (11), ieee (11), any (11), current (11), ram (11), information (11), toshiba (11), factors (11), attached (11), reliability (11), production (11), market (11), enclosure (11), rotational (11), binary (11), 100 (11), capacities (11), main (11), table (10), links (10), wayback (10), files (10), since (10), model (10), center (10), electronics (10), later (10), over (10), 2008 (10), technologies (10), average (10), mamr (10), there (10), models (10), end (10), law (10), 350 (10), layer (10), lower (10), spin (10), portable (10), because (10), many (10), mobile (9), international (9), array (9), independent (9), floppy (9), research (9), 2004 (9), 1962 (9), board (9), years (9), backblaze (9), without (9), 2021 (9), manufacturer (9), perpendicular (9), 1301 (9), much (9), moore (9), increase (9), recovery (9), three (9), characteristics (9), see (9), commonly (9), often (9), through (9), rates (9), physical (9), stored (9), like (9), moving (9), uses (9), single (9), increasing (9), prefixes (9), toggle (8), additional (8), page (8), 2026 (8), 2007 (8), format (8), network (8), pack (8), common (8), john (8), 1956 (8), product (8), development (8), samsung (8), channel (8), host (8), including (8), 1980s (8), 2006 (8), helium (8), article (8), larger (8), record (8), byte (8), integrity (8), volume (8), low (8), assisted (8), densities (8), spindle (8), close (8), 400 (8), sizes (8), although (8), second (8), million (8), units (8), internal (8), instead (8), small (8), would (8), cable (8), motor (8), magnet (8), pole (8), inc (7), multiple (7), century (7), control (7), 1960s (7), related (7), processing (7), personal (7), thomas (7), products (7), industry (7), hgst (7), controllers (7), ecc (7), paper (7), shingled (7), isbn (7), largest (7), circuit (7), 2022 (7), 512 (7), david (7), ramac (7), mellor (7), chris (7), out (7), will (7), based (7), well (7), special (7), set (7), same (7), 500 (7), similar (7), inches (7), fixed (7), include (7), applications (7), very (7), still (7), being (7), reported (7), then (7), speeds (7), connected (7), older (7), typical (7), upon (7), macintosh (7), known (7), you (6), unsourced (6), service (6), list (6), port (6), components (6), guide (6), electronic (6), world (6), linux (6), press (6), management (6), cloud (6), electric (6), general (6), fibre (6), intel (6), sold (6), off (6), 2001 (6), sheet (6), section (6), highest (6), support (6), class (6), example (6), cannot (6), embedded (6), doi (6), reliable (6), long (6), codes (6), direct (6), level (6), formatting (6), energy (6), microwave (6), now (6), both (6), down (6), slowed (6), structures (6), crash (6), total (6), shipped (6), compatible (6), winchester (6), found (6), needed (6), however (6), increased (6), gbit (6), pair (6), connection (6), enclosures (6), 1990s (6), tools (6), material (6), allow (6), servers (6), improvement (6), correction (6), became (6), late (6), side (6), servo (6), move (6), subsection (6), terms (5), references (5), image (5), american (5), org (5), 2002 (5), universal (5), dram (5), conference (5), store (5), quantum (5), cell (5), type (5), mid (5), 1997 (5), rom (5), 2005 (5), thin (5), core (5), server (5), eight (5), inside (5), 978 (5), introduction (5), tom (5), shilov (5), anton (5), times (5), expected (5), series (5), shipments (5), prices (5), internally (5), net (5), barracuda (5), 1109 (5), arxiv (5), apple (5), surfaces (5), faster (5), given (5), longer (5), magazine (5), feature (5), require (5), produced (5), sealed (5), packs (5), demand (5), windows (5), arms (5), volatile (5), replaced (5), generally (5), after (5), billion (5), though (5), four (5), gigabytes (5), manufactured (5), sales (5), cables (5), resulting (5), therefore (5), examples (5), temperature (5), 2000s (5), segments (5), zone (5), operation (5), mechanical (5), changes (5), removed (5), reduced (5), limit (5), scheme (5), top (5), outer (5), thus (5), reducing (5), amount (5), intended (5), position (5), specified (5), 1970s (5), megabytes (5), cylinder (5), grains (5), made (5), contents (4), search (4), view (4), code (4), commons (4), last (4), hidden (4), english (4), short (4), different (4), rotating (4), 20th (4), index (4), parity (4), redundancy (4), firewire (4), analog (4), expansion (4), nvme (4), case (4), blu (4), ray (4), blue (4), 1973 (4), 1971 (4), watson (4), associates (4), hitachi (4), express (4), advanced (4), encryption (4), edge (4), punched (4), writing (4), 1986 (4), discontinued (4), compact (4), film (4), area (4), smr (4), firmware (4), remove (4), improve (4), anandtech (4), 100tb (4), nimbus (4), review (4), assembled (4), laptop (4), printed (4), back (4), term (4), reed (4), solomon (4), patterned (4), s2cid (4), bibcode (4), considerations (4), order (4), report (4), line (4), dual (4), ultrastar (4), eamr (4), physics (4), magnetization (4), rosenthal (4), talk (4), replace (4), nearline (4), mass (4), takes (4), result (4), entire (4), expensive (4), terabyte (4), pmr (4), historical (4), floods (4), significantly (4), them (4), moved (4), complexity (4), bad (4), shock (4), what (4), factory (4), archives (4), reference (4), 1957 (4), twice (4), declining (4), difference (4), analysis (4), age (4), types (4), enough (4), extra (4), primary (4), database (4), 1000 (4), length (4), physically (4), refrigerators (4), led (4), exabytes (4), layers (4), every (4), terabytes (4), citation (4), height (4), failures (4), 1996 (4), storing (4), above (4), operate (4), offered (4), segment (4), earlier (4), variants (4), compared (4), mounted (4), referred (4), tend (4), rotate (4), rotation (4), visible (4), increases (4), issues (4), minor (4), friction (4), thermal (4), differential (4), developed (4), name (4), reduce (4), newer (4), allows (4), separate (4), self (4), reporting (4), encoding (4), inner (4), heat (4), buffer (4), growth (4), delay (4), desired (4), half (4), popular (4), those (4), stack (4), show (4), powers (4), partition (4), boot (4), simple (4), included (4), strength (4), uncorrected (4), soft (4), bearing (4), along (4), voice (4), coated (4), vhs (4), distributed (4), hide (4), sidebar (4), add (3), 128 (3), organization (3), license (3), pages (3), wikidata (3), description (3), inventions (3), instrument (3), architectures (3), oracle (3), throughput (3), mode (3), fault (3), tolerance (3), mirroring (3), arrays (3), redundant (3), convention (3), contains (3), protocol (3), img (3), iso (3), science (3), present (3), esata (3), ports (3), graphics (3), sound (3), chip (3), tube (3), 360 (3), share (3), deep (3), big (3), 1993 (3), 1985 (3), 1981 (3), integrated (3), stripe (3), community (3), scientific (3), facilities (3), facility (3), labs (3), solutions (3), mainframe (3), shugart (3), plus (3), peripherals (3), corporation (3), memories (3), bus (3), pcie (3), bought (3), chips (3), spun (3), kioxia (3), wear (3), command (3), 1998 (3), 1991 (3), laser (3), 1988 (3), 1995 (3), 1970 (3), wire (3), areas (3), zones (3), seek (3), showing (3), encyclopedia (3), learn (3), detection (3), further (3), reading (3), robert (3), reveals (3), 30tb (3), storagereview (3), worldwide (3), gigabyte (3), mccallum (3), 1955 (3), 520 (3), pre (3), your (3), important (3), biometric (3), security (3), backup (3), issn (3), transactions (3), brian (3), lost (3), micro (3), michael (3), tmag (3), magnetics (3), family (3), life (3), motion (3), tech (3), associated (3), 1974 (3), modules (3), part (3), lba (3), contiguous (3), chapter (3), giant (3), mat (3), hc550 (3), composite (3), companies (3), built (3), get (3), before (3), selling (3), future (3), enable (3), already (3), actual (3), completely (3), near (3), today (3), requires (3), release (3), generation (3), register (3), writes (3), kryder (3), component (3), continue (3), nature (3), gordon (3), reserve (3), notes (3), kozierok (3), charles (3), structure (3), mjm (3), ltd (3), mapping (3), flux (3), exchange (3), help (3), master (3), permanent (3), loss (3), joel (3), thailand (3), grow (3), need (3), 800 (3), resource (3), 1302 (3), manual (3), mechanically (3), provided (3), 1961 (3), 305 (3), point (3), decreasing (3), itself (3), arpaci (3), dusseau (3), limited (3), named (3), particles (3), 600 (3), factor (3), several (3), vendors (3), 1311 (3), dasd (3), ckd (3), object (3), maximum (3), laptops (3), rarely (3), nine (3), just (3), diagram (3), damaged (3), manufacturing (3), economy (3), sequential (3), sustained (3), requirements (3), connect (3), sometimes (3), slower (3), range (3), provide (3), counterparts (3), 2010s (3), users (3), having (3), fail (3), 110 (3), varying (3), widely (3), mtbf (3), does (3), designed (3), grade (3), environment (3), required (3), gmr (3), period (3), signal (3), certain (3), filter (3), too (3), flying (3), breather (3), filled (3), across (3), causing (3), caused (3), commands (3), communication (3), transfers (3), addressing (3), method (3), successor (3), latter (3), reserved (3), copper (3), ide (3), dma (3), adopted (3), cpu (3), copy (3), allowing (3), process (3), pin (3), signals (3), noise (3), creates (3), thereby (3), defragmentation (3), progress (3), function (3), nominal (3), fit (3), rack (3), six (3), prefix (3), interpretation (3), confusion (3), either (3), 1024 (3), spare (3), calculation (3), records (3), account (3), commercially (3), random (3), materials (3), feedback (3), arrowhead (3), sides (3), radially (3), forces (3), plate (3), sto (3), recorded (3), began (3), 1950s (3), content (3), subsystem (3), diameter (3), invented (3), electro (3), powered (3), module (3), 250 (3), 1725 (3), cache (3), languages (2), contact (2), privacy (2), policy (2), apply (2), wikimedia (2), categories (2), sister (2), needing (2), vague (2), ambiguous (2), cs1 (2), maint (2), deprecated (2), archival (2), written (2), states (2), databases (2), replication (2), availability (2), cassette (2), commodore (2), item (2), cdda (2), discs (2), comparison (2), formats (2), game (2), 1394 (2), obsolete (2), audio (2), jack (2), thunderbolt (2), ethernet (2), mosfet (2), supply (2), sshd (2), refreshable (2), braille (2), display (2), pointing (2), stick (2), light (2), vacuum (2), 370 (2), midrange (2), category (2), infrastructure (2), machines (2), public (2), union (2), atom (2), think (2), customer (2), commercial (2), terminology (2), grid (2), virtual (2), canada (2), hursley (2), york (2), lab (2), 1250 (2), weather (2), company (2), cognos (2), adstar (2), former (2), laboratories (2), red (2), platform (2), analytics (2), reduction (2), statistical (2), carbon (2), microprocessors (2), eagle (2), flashsystem (2), cdc (2), fujitsu (2), equipment (2), burroughs (2), defunct (2), work (2), incits (2), pci (2), msata (2), businesses (2), renamed (2), solidigm (2), hynix (2), micron (2), ocz (2), sandisk (2), forward (2), open (2), collection (2), key (2), mark (2), 105 (2), super (2), assist (2), magneto (2), effect (2), 1999 (2), worm (2), 1978 (2), laserdisc (2), racetrack (2), mram (2), bubble (2), 1968 (2), twistor (2), 1949 (2), 1932 (2), drum (2), compression (2), semiconductor (2), usage (2), acceleration (2), parts (2), opened (2), message (2), please (2), removing (2), projects (2), scott (2), 4th (2), decad (2), gary (2), fontana (2), landscape (2), coughlin (2), enables (2), alphr (2), 16tb (2), 15tb (2), advantages (2), usenix (2), fast (2), santa (2), clara (2), california (2), force (2), gen (2), statista (2), 1976 (2), jcmit (2), martin (2), 528 (2), fat (2), 15k (2), versus (2), passport (2), safe (2), lyle (2), pro (2), exos (2), differences (2), extremetech (2), accurately (2), predict (2), die (2), google (2), trends (2), recover (2), library (2), schabes (2), manfred (2), lei (2), dave (2), listed (2), johnson (2), action (2), settlement (2), email (2), lawsuit (2), announced (2), team (2), 650 (2), measure (2), idema (2), count (2), attachment (2), shall (2), overview (2), breakthrough (2), promising (2), magnetoresistance (2), grochowski (2), edward (2), dimensional (2), finally (2), launches (2), link (2), cite (2), web (2), fullerton (2), eric (2), challenges (2), recent (2), real (2), roadmaps (2), msst2018 (2), start (2), 60tb (2), could (2), 2024 (2), mozaic (2), delayed (2), architecture (2), redesigned (2), closely (2), worth (2), lwn (2), ship (2), next (2), plumer (2), paradigms (2), 1201 (2), 5543 (2), cagr (2), slowing (2), almost (2), technical (2), migrating (2), return (2), trend (2), projections (2), forever (2), eventually (2), ability (2), flabbergasting (2), federal (2), innovation (2), hayes (2), techniques (2), resistance (2), legacy (2), correcting (2), cmos (2), magview (2), mag (2), spring (2), webpage (2), why (2), piece (2), spins (2), cycle (2), notebook (2), addressable (2), apparatus (2), heath (2), swinging (2), microsoft (2), workstation (2), a22 (2), 7094 (2), 1401 (2), seeking (2), 355 (2), operations (2), klein (2), andy (2), held (2), san (2), jose (2), quarter (2), domingo (2), lack (2), once (2), controlled (2), days (2), 171 (2), samos (2), 164 (2), milliseconds (2), follows (2), revolutions (2), minute (2), expressed (2), multiples (2), historically (2), variety (2), run (2), initially (2), iron (2), oxide (2), alloy (2), 910 (2), comparable (2), date (2), patent (2), 3340 (2), 2314 (2), describe (2), includes (2), shared (2), hybrid (2), automatic (2), portal (2), growing (2), revenue (2), grew (2), 175 (2), tbit (2), doubling (2), desktops (2), superseded (2), fewer (2), correctable (2), 167 (2), 166 (2), competition (2), consolidation (2), published (2), quality (2), adjusted (2), scale (2), decreased (2), evolution (2), recorders (2), 152 (2), surveillance (2), 160 (2), silent (2), corruption (2), running (2), less (2), adapter (2), 159 (2), environments (2), possible (2), relatively (2), relation (2), via (2), better (2), offers (2), compatibility (2), features (2), packaged (2), taken (2), even (2), five (2), whereas (2), become (2), glass (2), unless (2), minimize (2), overcome (2), individual (2), rely (2), 147 (2), annualized (2), equivalent (2), remained (2), adjusting (2), risk (2), failing (2), indicate (2), relevant (2), frequently (2), mellon (2), recovered (2), replacing (2), identical (2), free (2), transferred (2), onto (2), damage (2), unix (2), particular (2), contamination (2), results (2), temporarily (2), partially (2), proper (2), rotates (2), occurs (2), crashes (2), sensors (2), holes (2), cover (2), spinning (2), entered (2), humidity (2), extended (2), spacing (2), challenged (2), citations (2), transmitted (2), oriented (2), capable (2), standards (2), directly (2), tasks (2), pata (2), originally (2), conductor (2), ultra (2), dsp (2), detected (2), remapping (2), monitoring (2), within (2), consumption (2), depends (2), powerful (2), somewhat (2), 300 (2), megabyte (2), generator (2), influenced (2), layout (2), 132 (2), improved (2), kept (2), themselves (2), procedure (2), right (2), assembly (2), purpose (2), contain (2), falling (2), dimensions (2), 130 (2), followed (2), respectively (2), wide (2), beginning (2), chassis (2), sized (2), approximately (2), roughly (2), washing (2), drawer (2), complete (2), together (2), consumers (2), meaning (2), 931 (2), 117 (2), 107 (2), advertised (2), metadata (2), guid (2), performed (2), normally (2), hold (2), directory (2), detecting (2), timing (2), usable (2), knowledge (2), partitioning (2), subsystems (2), appear (2), checksum (2), gross (2), calculated (2), linear (2), furthermore (2), accessible (2), take (2), stated (2), shipping (2), compete (2), concept (2), contrast (2), covers (2), trilemma (2), particularly (2), grain (2), generate (2), instability (2), superparamagnetic (2), advancement (2), below (2), others (2), specifications (2), pool (2), supported (2), ldpc (2), supplanting (2), make (2), extensive (2), determined (2), employed (2), handling (2), facing (2), left (2), hub (2), dedicated (2), actuators (2), making (2), produces (2), radial (2), opposite (2), produce (2), bottom (2), nib (2), beneath (2), front (2), encoded (2), torque (2), adjacent (2), gap (2), shield (2), placed (2), created (2), fgl (2), sil (2), coupled (2), might (2), effects (2), contemporary (2), norm (2), protection (2), thick (2), transitions (2), represented (2), improving (2), phase (2), portability (2), around (2), 21st (2), featured (2), did (2), greatly (2), swing (2), primarily (2), comb (2), characters (2), horizontally (2), hrs (2), square (2), cubic (2), 1954 (2), possibly (2), revenues (2), secondary (2), holographic (2), ecram (2), cbram (2), videotape (2), phonograph (2), reram (2), nvram (2), 1947 (2), ported (2), sram (2), bank (2), dump (2), validation (2), coherence (2), here (2), appearance (2), upload (2), norsk (2), bahasa (2), беларуская (2), log (2), create (2), donate (2), menu (2), topic, cookie, statement, statistics, developers, conduct, legal, safety, contacts, disclaimers, text, site, agree, registered, trademark, profit, foundation, creative, attribution, sharealike, rendered, parsoid, edited, utc, clips, cleanup, project, auto, scaled, images, webarchive, template, mdy, dates, https, php, title, hard_disk_drive, oldid, 1375252035, yale, lux, musicbrainz, israel, czech, republic, bnf, france, united, national, gnd, authority, zfs, mdadm, geom, bioctl, scalability, failover, degraded, principles, nested, levels, striping, scrubbing, kernal, cmd, 1581, indus, msd, 1571, 1570, 1551, 1541, 1540, cbm, 9090, 9060, sfd, 1001, 8250, 8050, 4040, 4031, 3040, 2040, 2031, 8280, 8062, 8061, 8060, 1531, 1530, datasette, indicates, spans, bulk, sidecar, vfd, ima, imz, dms, dc42, dart, adf, adz, wim, vmdk, vhd, vdi, udif, qcow, ndif, fvd, dmg, uif, nrg, mdx, mdf, mds, isz, ccd, sub, daa, bin, cue, pioneers, vga, dvi, hdmi, displayport, fax, modem, vrm, smps, bios, motherboard, microprocessor, central, speakers, plotter, printer, screen, monitor, output, softcam, webcam, microphone, gpu, scanner, keyboard, trackball, touchscreen, touchpad, trackpad, mouse, pen, tablet, input, basic, typewriters, foss, navigational, boxes, unions, scicomp, plex, mathematica, lucifer, cipher, chess, tournament, holocaust, globalfoundries, dynamic, thought, wallace, corp, sports, teams, rugby, football, boy, his, arvind, krishna, ginni, rometty, samuel, palmisano, louis, gerstner, fellows, akers, opel, frank, cary, vincent, learson, 1914, ceos, slogan, globally, engineer, workload, financial, swaps, scanning, tunneling, microscope, sabre, airline, reservation, relational, keypunch, cynefin, framework, automated, teller, universe, smarter, planet, skillsbuild, great, mind, challenge, fellow, develothon, thunder, initiatives, rochester, office, building, cambridge, yamato, hakozaki, buildings, seattle, honolulu, chicago, toronto, rome, towers, atlanta, atlantic, montreal, rené, lévesque, underground, bureau, retail, microelectronics, merative, lotus, lexmark, kyndryl, eduquest, ambra, taligent, kaleida, aim, alliance, hrl, hat, india, subsidiaries, kenexa, hashicorp, promontory, consulting, confluent, government, apptio, entities, websphere, granite, watsonx, automation, manager, tivoli, spss, rational, openqasm, qiskit, purequery, planning, mashup, ilog, fortran, criminal, utilising, connections, cloudant, thinkcentre, thinkpad, selectric, powerpc, gene, condor, heron, osprey, ds8000, acquisition, lenovo, mergers, acquisitions, war, xebec, wangco, tokico, texas, instruments, teac, tandon, syquest, storagetek, siemens, sequel, sagem, rodime, ricoh, priam, prairietek, potter, philips, pertec, panasonic, olivetti, ope, okidata, ohio, nomaï, nippon, nec, ncr, mitsumi, mitsubishi, ministor, miniscribe, micropolis, memorex, maxtor, librascope, kyocera, kennedy, kalok, jvc, iomega, intégral, imprimis, hyosung, hokushin, works, hewlett, packard, magicstor, fuji, excelstor, epson, emulex, diablo, dataproducts, datapoint, cornice, conner, cii, honeywell, bull, caelus, calcomp, castlewood, itoh, bryant, basf, avatar, atasi, anelex, ampex, alps, t13, t11, t10, sssi, snia, sff, committee, nvmhci, group, onfi, jedec, organizations, edsff, configurations, nvm, ahci, smi, pmc, sierra, phison, marvell, maxiotek, goke, greenliant, fadu, sandforce, indilinx, bankrupt, assets, stec, fusion, captive, xmc, ymtc, joint, venture, amplification, leveling, trim, secure, erase, disturb, provisioning, iops, garbage, slc, mlc, 1948, barcode, 1930s, recognition, 1904, notched, 1880s, 1800s, 1640s, 3000, bce, papyrus, antiquity, dlt, floptical
Text of the page (random words):
lting in much larger storage capacity 66 for example a typical 1 tb hard disk with 512 byte sectors provides additional capacity of about 93 gb for the ecc data 67 in the newest drives as of 2009 update 68 low density parity check codes ldpc were supplanting reed solomon ldpc codes enable performance close to the shannon limit and thus provide the highest storage density available 68 69 typical hard disk drives attempt to remap the data in a physical sector that is failing to a spare physical sector provided by the drive s spare sector pool also called reserve pool 70 while relying on the ecc to recover stored data while the number of errors in a bad sector is still low enough the s m a r t self monitoring analysis and reporting technology feature counts the total number of errors in the entire hdd fixed by ecc although not on all hard drives as the related s m a r t attributes hardware ecc recovered and soft ecc correction are not consistently supported and the total number of performed sector remappings as the occurrence of many such errors may predict an hdd failure the no id format developed by ibm in the mid 1990s contains information about which sectors are bad and where remapped sectors have been located 71 only a tiny fraction of the detected errors end up as not correctable examples of specified uncorrected bit read error rates include 2013 specifications for enterprise sas disk drives state the error rate to be one uncorrected bit read error in every 10 16 bits read 72 73 2018 specifications for consumer sata hard drives state the error rate to be one uncorrected bit read error in every 10 14 bits 74 75 within a given manufacturers model the uncorrected bit error rate is typically the same regardless of capacity of the drive 72 73 74 75 the worst type of errors are silent data corruptions which are errors undetected by the disk firmware or the host operating system some of these errors may be caused by hard disk drive malfunctions while others originate elsewhere in the connection between the drive and the host 76 development edit leading edge hard disk drive areal densities from 1956 through 2009 compared to moore s law by 2016 progress had slowed significantly below the extrapolated density trend 77 the rate of areal density advancement was similar to moore s law doubling every two years through 2010 60 per year during 1988 1996 100 during 1996 2003 and 30 during 2003 2010 78 speaking in 1997 gordon moore called the increase flabbergasting 79 while observing later that growth cannot continue forever 80 price improvement decelerated to 12 per year during 2010 2017 81 as the growth of areal density slowed the rate of advancement for areal density slowed to 10 per year during 2010 2016 82 and there was difficulty in migrating from perpendicular recording to newer technologies 83 as bit cell size decreases more data can be put onto a single drive platter in 2013 a production desktop 3 tb hdd with four platters would have had an areal density of about 500 gbit in 2 which would have amounted to a bit cell comprising about 18 magnetic grains 11 by 1 6 grains 84 since the mid 2000s areal density progress has been challenged by a superparamagnetic trilemma involving grain size grain magnetic strength and ability of the head to write 85 in order to maintain acceptable signal to noise smaller grains are required smaller grains may self reverse electrothermal instability unless their magnetic strength is increased but known write head materials are unable to generate a strong enough magnetic field sufficient to write the medium in the increasingly smaller space taken by grains magnetic storage technologies are being developed to address this trilemma and compete with flash memory based solid state drives ssds in 2013 seagate introduced shingled magnetic recording smr 86 intended as something of a stopgap technology between pmr and seagate s intended successor heat assisted magnetic recording hamr smr utilizes overlapping tracks for increased data density at the cost of design complexity and lower data access speeds particularly write speeds and random access 4k speeds 87 88 by contrast hgst now part of western digital focused on developing ways to seal helium filled drives instead of the usual filtered air since turbulence and friction are reduced higher areal densities can be achieved due to using a smaller track width and the energy dissipated due to friction is lower as well resulting in a lower power draw furthermore more platters can be fit into the same enclosure space although helium gas is notoriously difficult to prevent escaping 89 thus helium drives are completely sealed and do not have a breather port unlike their air filled counterparts they have two top covers the second is laser welded in place and is the only one visible from the exterior 90 other recording technologies are either under research or have been commercially implemented to increase areal density including seagate s heat assisted magnetic recording hamr hamr requires a different architecture with redesigned media and read write heads new lasers and new near field optical transducers 91 hamr shipped commercially in early 2024 92 after technical issues delayed its introduction by more than a decade from earlier projections as early as 2009 93 94 95 96 hamr s planned successor bit patterned recording bpr 97 has been removed from the roadmaps of western digital and seagate 98 western digital s microwave assisted magnetic recording mamr 99 100 also referred to as energy assisted magnetic recording eamr was sampled in 2020 with the first eamr drive the ultrastar hc550 shipping in late 2020 101 102 103 two dimensional magnetic recording tdmr 84 104 and current perpendicular to plane giant magnetoresistance cpp gmr heads have appeared in research papers 105 106 107 some drives have adopted dual independent actuator arms to increase read write speeds and compete with ssds 108 a 3d actuated vacuum drive 3dhd concept 109 and 3d magnetic recording have been proposed 110 depending upon assumptions on feasibility and timing of these technologies seagate forecasts that areal density will grow 20 per year during 2020 2034 42 capacity edit two seagate barracuda drives from 2003 and 2009 respectively 160 gb and 1 tb as of 2025 update seagate offers capacities up to 36 tb msata ssd on top of a 2 5 inch hard drive the highest capacity hdds shipping commercially as of 2025 update are 36 tb 20 the capacity of a hard disk drive as reported by an operating system to the end user is smaller than the amount stated by the manufacturer for several reasons e g the operating system using some space use of some space for data redundancy space use for file system structures confusion of decimal prefixes and binary prefixes can also lead to errors calculation edit modern hard disk drives appear to their host controller as a contiguous set of logical blocks and the gross drive capacity is calculated by multiplying the number of blocks by the block size this information is available from the manufacturer s product specification and from the drive itself through use of operating system functions that invoke low level drive commands 111 112 older ibm and compatible drives e g ibm 3390 using the ckd record format have variable length records such drive capacity calculations must take into account the characteristics of the records some newer dasd simulate ckd and the same capacity formulae apply the gross capacity of older sector oriented hdds is calculated as the product of the number of cylinders per recording zone the number of bytes per sector most commonly 512 and the count of zones of the drive citation needed some modern sata drives also report cylinder head sector chs capacities but these are not physical parameters because the reported values are constrained by historic operating system interfaces the c h s scheme has been replaced by logical block addressing lba a simple linear addressing scheme that locates blocks by an integer index which starts at lba 0 for the first block and increments thereafter 113 when using the c h s method to describe modern large drives the number of heads is often set to 64 although a typical modern hard disk drive has between one and four platters in modern hdds spare capacity for defect management is not included in the published capacity however in many early hdds a certain number of sectors were reserved as spares thereby reducing the capacity available to the operating system furthermore many hdds store their firmware in a reserved service zone which is typically not accessible by the user and is not included in the capacity calculation for raid subsystems data integrity and fault tolerance requirements also reduce the realized capacity for example a raid 1 array has about half the total capacity as a result of data mirroring while a raid 5 array with n drives loses 1 n of capacity which equals to the capacity of a single drive due to storing parity information raid subsystems are multiple drives that appear to be one drive or more drives to the user but provide fault tolerance most raid vendors use checksums to improve data integrity at the block level some vendors design systems using hdds with sectors of 520 bytes to contain 512 bytes of user data and eight checksum bytes or by using separate 512 byte sectors for the checksum data 114 some systems may use hidden partitions for system recovery reducing the capacity available to the end user without knowledge of special disk partitioning utilities like diskpart in windows 115 formatting edit main article disk formatting data is stored on a hard drive in a series of logical blocks each block is delimited by markers identifying its start and end error detecting and correcting information and space between blocks to allow for minor timing variations these blocks often contained 512 bytes of usable data but other sizes have been used as drive density increased an initiative known as advanced format extended the block size to 4096 bytes of usable data with a resulting significant reduction in the amount of disk space used for block headers error checking data and spacing the process of initializing these logical blocks on the physical disk platters is called low level formatting which is usually performed at the factory and is not normally changed in the field 116 high level formatting writes data structures used by the operating system to organize data files on the disk this includes writing partition and file system structures into selected logical blocks for example some of the disk space will be used to hold a directory of disk file names and a list of logical blocks associated with a particular file examples of partition mapping scheme include master boot record mbr and guid partition table gpt examples of data structures stored on disk to retrieve files include the file allocation table fat in the ms dos file system and inodes in many unix file systems as well as other operating system data structures also known as metadata as a consequence not all the space on an hdd is available for user files but this system overhead is usually small compared with user data units edit see also binary prefix disk drives decimal and binary unit prefixes interpretation 117 118 capacity advertised by manufacturers p capacity expected by some consumers q reported capacity windows q macos ver 10 6 p with prefix bytes bytes diff 100 gb 100 000 000 000 107 374 182 400 7 37 93 1 gb 100 gb 1 tb 1 000 000 000 000 1 099 511 627 776 9 95 931 gb 1 000 gb 1 000 000 mb in the early days of computing the total capacity of hdds was specified in seven to nine decimal digits frequently truncated with the idiom millions 119 34 by the 1970s the total capacity of hdds was given by manufacturers using si decimal prefixes such as megabytes 1 mb 1 000 000 bytes gigabytes 1 gb 1 000 000 000 bytes and terabytes 1 tb 1 000 000 000 000 bytes 117 120 121 122 however capacities of memory are usually quoted using a binary interpretation of the prefixes i e using powers of 1024 instead of 1000 software reports hard disk drive or memory capacity in different forms using either decimal or binary prefixes the microsoft windows family of operating systems uses the binary convention when reporting storage capacity so an hdd offered by its manufacturer as a 1 tb drive is reported by these operating systems as a 931 gb hdd mac os x 10 6 snow leopard uses decimal convention when reporting hdd capacity 123 the default behavior of the df command line utility on linux is to report the hdd capacity as a number of 1024 byte units 124 the difference between the decimal and binary prefix interpretation caused some consumer confusion and led to class action suits against hdd manufacturers the plaintiffs argued that the use of decimal prefixes effectively misled consumers while the defendants denied any wrongdoing or liability asserting that their marketing and advertising complied in all respects with the law and that no class member sustained any damages or injuries 125 126 127 in 2020 a california court ruled that use of the decimal prefixes with a decimal meaning was not misleading 128 form factors edit main article list of disk drive form factors 8 5 25 3 5 2 5 1 8 and 1 inch hdds together with a ruler to show the size of platters and read write heads a newer 2 5 inch 63 5 mm 6 495 mb hdd compared to an older 5 25 inch full height 110 mb hdd portable hard drives in enclosures ibm s first hard disk drive the ibm 350 used a stack of fifty 24 inch platters stored 3 75 mb of data approximately the size of one modern digital picture and was of a size comparable to two large refrigerators in 1962 ibm introduced its model 1311 disk which used six 14 inch nominal size platters in a removable pack and was roughly the size of a washing machine this became a standard platter size for many years used also by other manufacturers 129 the ibm 2314 used platters of the same size in an eleven high pack and introduced the drive in a drawer layout sometimes called the pizza oven although the drawer was not the complete drive into the 1970s hdds were offered in standalone cabinets of varying dimensions containing from one to four hdds beginning in the late 1960s drives were offered that fit entirely into a chassis that would mount in a 19 inch rack digital s rk05 and rl01 were early examples using single 14 inch platters in removable packs the entire drive fitting in a 10 5 inch high rack space six rack units in the mid to late 1980s the similarly sized fujitsu eagle which used coincidentally 10 5 inch platters was a popular product with increasing sales of microcomputers having built in floppy disk drives fdds hdds that would fit to the fdd mountings became desirable starting with the shugart associates sa1000 hdd form factors initially followed those of 8 inch 5 1 4 inch and 3 1 2 inch floppy disk drives although referred to by these nominal sizes the ...
|
