A hard disk drive (HDD), hard disk, hard drive or fixed disk is a data storage device used for storing and retrieving digital information using one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material.

HDDs are accessed over one of a number of bus types, including as of parallel ATA (PATA, also called IDE or EIDE; described before the introduction of SATA as ATA), Serial ATA (SATA), SCSI, Serial Attached SCSI (SAS), and Fibre Channel. Bridge circuitry is sometimes used to connect HDDs to buses with which they cannot communicate natively, such as IEEE 1394, USB and SCSI.



Forward to / Adaptec / Apple / obsolete computers / Sun pinouts or follow to 25 MODERN hardware pinouts.
  • 26 pins unspecified
    3.5 inch micro Floppy Disk Drive connector (26 pin) micro conector (26x1)
  • 44 pin IDC (2 mm pitch) female
    ATA (44) internal This connector is mostly used for 2.5 IDE HDD of notebooks and so on. Pins 1-40 are the same as the IDE/ATA 40 pin connector, but the spacing between pins is smaller and they are therefore electronically, but not physically compatible.
  • 50 pin IDC male50 pin IDC female
    ATA (50) internal This connector is mostly used for 2.5 IDE HDD of laptops and some other device. Equal to ATA (44) connector, except 50 pin connector used.
  • 50 pin IDC female
    ATA (50) internal pinout a 50 pin cable will fit most 2.5" IDE drives and bring the extra (master/slave etc) drive pins back to the system board. The connector has the same 2mm pitch as a 40 or 44 pin cable. The only place I have seen this cable is in a Fostex DF-4 Portable 4 track recorder, but it may exist in other places. It is nearly documented at http://paulski.com/zpages.php?id=1717 but he missed the two missing pins at positions 5 and 6. It seems there are a few ways 2.5" IDE drives are wired.. They will all be a subset of.. 40 pins for data 4 pins for power and optionally 6 pins 1 blank row (2 pins), and 4 pins for master/slave.
  • 40 pin IDC female50 pin IDC female
    ATA 50 to 40 pin (notebook CD-ROM) This adapter will enable you to connect a 50 pin CD-ROM data cable to 40 pin ATA bus.
  • 34 pin IDC male34 pin IDC female
    ESDI ESDI=Enhanced Small Device Interface. Developed by Maxtor in the early 1980?s as an upgrade and improvement to the ST506 design.
  • 34 pin IDC female34 pin IDC female
    ESDI cable The ESDI interface requires two cables, one for control and one for data. The control cable is shared between the two drives.
  • 26 pin IDC male25 pin D-SUB female
    Extensa 600/600 CD external FDD Extensa 600/600 CD external FDD in comparsion with two standart ones
  • 25 pin D-SUB female25 pin D-SUB male
    External SCSI D-Sub (Future Domain) Seems to be available on some Future Domain SCSI-controllers only.
  • 34 pin IDC female34 pin IDC female
    Floppy cable 
  • 34 pin IDC male34 pin IDC female
    Floppy Diskdrive  
  • 40 pin IDC female40 pin IDC female
    IDE cable 
  • 40 pin IDC male40 pin IDC female
    IDE Internal (old) IDE=Integrated Drive Electronics.Developed by Compaq and Western Digital. Newer version of IDE goes under the name ATA=AT bus Attachment.
  • SCSI SCSI stands for Small Computer Systems Interface. It?s a standard for connecting peripherals to your computer via a standard hardware interface, which uses standard SCSI commands
  • 25 pin D-SUB male50 pin hi-density D-SUB male
    SCSI cable (D-Sub to Hi D-Sub) Ultra SCSI Single-ended 
  • 50 pin Amphenol female50 pin Amphenol male
    SCSI Centronics 50 pin (Differential) use RJ-21 (or RJ21) registered jack standard connector, also known as a 50-pin telco connector, or an Amphenol connector.
  • 50 pin Amphenol female50 pin Amphenol male
    SCSI Centronics 50 pin (Single-ended) use RJ-21 (or RJ21) registered jack standard connector, also known as a 50-pin telco connector, or an Amphenol connector.
  • 25 pin D-SUB female25 pin D-SUB male
    SCSI External D-Sub (PC/Amiga/Apple Macintosh) 
  • 60 pin BURNDY (C-60)
    SCSI External IBM Burndy Special invention by IBM for use on IBM RS/6000 and IBM PS/2
  • 50 pin IDC male50 pin IDC female
    SCSI Internal  SCSI=Small Computer System Interface. Based on an original design by Shugart Associates. SCSI was ratified in 1986.
  • 50 pin IDC male50 pin IDC female
    SCSI Internal (Differential) 
  • 50 pin hi-density D-SUB female50 pin hi-density D-SUB male
    SCSI-2 External Hi D-Sub (Differential) 
  • 80 pin SCSI SCA-2 female
    SCSI-3 External Hi D-Sub SCA=Single connector Attachment
  • 68 pin hi-density D-SUB female68 pin hi-density D-SUB male
    SCSI-3 External Hi D-Sub (Differential) 
  • 80 pin SCSI SCA-2 female
    SCSI-3 External Hi D-Sub (Differential) SCA=Single connector Attachment
  • 68 pin hi-density D-SUB female68 pin hi-density D-SUB male
    SCSI-3 Low Voltage Differential/Single Ended (LVD/SE) external connector 
  • 50 pin hi-density D-SUB female50 pin hi-density D-SUB male
    SCSI-II external, Ultra SCSI (Single-ended) 
  • 68 pin Slimline
    Slimline CD-ROM connector Used in some Compaq PC
  • 8 pin DIN female8 pin DIN male
    Sord M5 cassette connector 
  • 34 pin IDC male34 pin male EDGE
    ST506/412 Developed by Seagate. Also known as MFM or RLL since these are the encoding methods used to store data. Seagate originally developed it to support their ST506 (5 MB) and ST412 (10 MB) drives.
  • 34 pin IDC female34 pin IDC female
    ST506/412 cable 

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