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Hard disk drive

Hard disk drive
Interior of a hard disk drive
CaptionInterior of a hard disk drive
Invent-dateDecember 24, 1954
Invent-nameAn IBM team led by Rey Johnson

     Home | computer hardware | Hard disk drive

:Enterprise disk drive redirects here.A hard disk drive (HDD) is a non-volatile, random access device for digital data. It features rotating rigid platters on a motor-driven spindle within a protective enclosure. Data is magnetically read from and written to the platter by read/write heads that float on a film of air above the platters.

Introduced by IBM in 1956, hard disk drives have fallen in cost and physical size over the years while dramatically increasing in capacity. Hard disk drives have been the dominant device for secondary storage of data in general purpose computers since the early 1960s. They have maintained this position because advances in their areal recording density have kept pace with the requirements for secondary storage. Today's HDDs operate on high-speed serial interfaces; i.e., serial ATA (SATA) or serial attached SCSI (SAS).

Hard disk drive Video

Fun with an old hard drive. Took the platters out of many hard drives and put them into one drive. Spin it up to speed and give it a nudge, then watch the fun.
0.22 min. | 4.62 user rating
Simple operations performed by a hard drive with no cover, so that you can see what it looks like inside. This experiment was performed on an old hard drive, do not try this with newer expensive hard drives, it is a bit risky. Details & Specifications â  Model of drive: Samsung WU32543A 2.5GB â  Test performed in Windows XP â  Disk died about three months after being opened Joshua Marius
1.92 min. | 4.68 user rating
A selfbuild HDD-Speaker playing the ImperialMarch (Star Wars Theme)
0.58 min. | 4.93 user rating
Here I show you how to stop a corrupted HD from clicking. Other tools can be used but it recommened to follow exactly as I do for the fastest result.
0.95 min. | 4.09 user rating
Try to compare it with one of those old LP records: imagine you're playing a song and moving the record player which is like moving a running laptop when it's reading/writing on the hard drive. Just one little hit and you might have a crack in your LP record. If that's not sooo big you won't even notice it on a hard drive because the electronic takes care of it by trying to avoid that section.
0.50 min. | 4.10 user rating
If you have any questions, please read through the comments to see if anything has been answered already. BACK UP your old PlayStation 3 first if you're transferring a hard drive. NOTE: When you start up the system for the first time with the new hard drive installed, you'll get a message saying "The system software cannot be run correctly". Don't panic. Here's what you must do: Get a USB memory stick, put it into your computer. On that USB stick, create a folder and name it PS3 (with all caps like that). Then, make another folder within the PS3 folder and name that UPDATE. Go to the Sony website and find the latest firmware update, which is currently 3.0. It's easy to find on the website. Then simply download it into the UPDATE folder. Once that is done, take the memory stick out and pop it into your PS3. Then press and hold the START and SELECT buttons at the same time on the controller and the system will locate the update! From there it's all straight forward.
2.17 min. | 4.91 user rating
A tour of the HG10, Canon's new High Definition camcorder with a built-in Hard Disk Drive.
3.43 min. | 4.55 user rating
This video shows how to upgrade or replace a Hard Disk Drive in a Dell Notebook. The procedure is very similar in all Dell notebooks across the Latitude and Inspiron ranges.
2.88 min. | 4.68 user rating
Visit for the schematic and information! - This is a three-phase BLDC motor from a 5-1 half-height hard drive assembly. I've done my own driver circuit for it, running closed loop with no current limiting.
2.22 min. | 4.64 user rating
Part 1 of 2: Open my iMac Flat Screen (from Spring 2008) and remove hard drive. Hi-Res photos and compatible hard drives at
6.28 min. | 4.69 user rating

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Western Digital Debuts 3TB Hard Disk Drive - ITProPortal Tweet this news
ITProPortal--Western Digital (WD) has unveiled its first 3TB -hard disk drive-, one which it calls the world's largest capacity SATA hard drive which in itself is not ... - Date : Tue, 19 Oct 2010 21:47:22 GMT+00:00
Oracle's Sun Fire X2270 M2 Server Architecture - TechRepublic Tweet this news
TechRepublic---...- alongside standard higher capacity -Hard Disk Drive- (HDD) storage. In addition, Integrated Lights Out Management (ILOM) capabilities are included in the ... - Date : Sun, 31 Oct 2010 23:49:57 GMT+00:00
Industry's First 4KB-Block LDPC Hard Disk Drive System-on-Chip (SoC) Sampled ... - NewsBlaze Tweet this news
NewsBlaze--Its mixed signal processing and iterative data recovery technologies enable -hard disk drive- (HDD) and solid-state drive (SSD) OEMs to increase storage ... - Date : Tue, 26 Oct 2010 15:52:18 GMT+00:00
MacBook Air could foretell death of laptop hard drives - Macworld Tweet this news
Macworld--However, Handy did note, “That's all well and good, but it's still an order of magnitude more than -hard disk drive- prices, which I would expect to be less ... - Date : Mon, 25 Oct 2010 21:39:38 GMT+00:00

Capacity measurements :
SI prefixes (hard drive) equivalent Binary prefixes (OS) equivalent
1 TB (Terabyte) 1 * 10004 B 0.9095 TiB (Tebibyte) 0.9095 * 10244 B
1000 GB (Gigabyte) 1000 * 10003 B 931.3 GiB (Gibibyte) 931.3 * 10243 B
1,000,000 MB (Megabyte) 1,000,000 * 10002 B 953,674.3 MiB (Mebibyte) 953,674.3 * 10242 B
1,000,000,000 kB (Kilobyte) 1,000,000,000 * 1000 B 976,562,500 KiB (Kibibyte) 976,562,500 * 1024 B
1,000,000,000,000 B (byte)
1,000,000,000,000 B (byte)

Seek time :
Form factor Width Height Largest capacity Platters (Max)
3.5″ 102 mm 25.4 mm 3 TB (2010) 5
2.5″ 69.9 mm 7 � 15 mm 1.5 TB (2010) 4
1.8″ 54 mm 8 mm 320 GB (2009) 3

Seek time :
Form factor Width Largest capacity Platters (Max)
5.25″ FH 146 mm 47 GB (1998) 14
5.25″ HH 146 mm 19.3 GB (1998) 4
1.3″ 43 mm 40 GB (2007) 1
1″ (CFII/ZIF/IDE-Flex) 42 mm 20 GB (2006) 1
0.85″ 24 mm 8 GB (2004) 1

Disk interface families used in personal computers :
Acronym or abbreviation Meaning Description
SASI Shugart Associates System Interface Historical predecessor to SCSI.
SCSI Small Computer System Interface Bus oriented that handles concurrent operations.
SAS Serial Attached SCSI Improvement of SCSI, uses serial communication instead of parallel.
ST-506 Seagate Technology Historical Seagate interface.
ST-412 Seagate Technology Historical Seagate interface (minor improvement over ST-506).
ESDI Enhanced Small Disk Interface Historical; backwards compatible with ST-412/506, but faster and more integrated.
ATA (PATA) Advanced Technology Attachment Successor to ST-412/506/ESDI by integrating the disk controller completely onto the device. Incapable of concurrent operations.
SATA Serial ATA Modification of ATA, uses serial communication instead of parallel.

Magnetic storage media

Wire (1898) * Tape (1928) * Drum (1932) * Ferrite core (1949) * Hard disk (1956) * Stripe card (1956) * MICR (1956) * Thin film (1962) * CRAM (1962) * Twistor (~1968) * Floppy disk (1969) * Bubble (~1970) * MRAM (1995) * Racetrack (2008) |

Basic computer components

Input devicesKeyboard * Light pen * Mouse * Microphone * Webcam
Output devicesMonitor * Speakers * Printer
Removable data storageFloppy disk * Compact Disc ReWritable/DVD Drive * USB flash drive * Memory card
Computer caseCentral processing unit * RAM * Video card * Sound card * Motherboard * Power supply * Hard drive
Data portsSerial port * Parallel port * Universal Serial Bus (USB)

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