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.



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  • 7 pin eSATA connector drawing
    eSATA (External SATA) eSATA provides a variant of SATA for external connectivity. It uses a more robust connector, longer shielded cables, and stricter electrical standards. The protocol and logical signaling are identical to internal SATA.
  • 13 pin eSATA USB hybrid (EUHP) connector drawing
    eSATA USB hybrid (EUHP) external connector eSATAp (also known as Power eSATA, eSATA/USB Combo, eSATA USB Hybrid Port (EUHP)) is a combination connection for external storage devices.
  • 75 pin M.2 Edge (B and M notched) connector drawing
    M.2 (NGFF) connector M.2 (Next Generation Form Factor, NGFF), is a specification for computer expansion cards. Having a small and flexible physical specification, the M.2 is suitable for solid-state storage applications, especially when used in small devices such as ultrabooks or tablets.
  • 26 pin SFF-8088 Mini-SAS external connector drawing
    Mini-SAS 4x SFF-8088 connector SFF-8088 is irimarily used to connect one chassis to another chassis through the use of external multiline cabling. Nowdays it is the most widely used external SAS cable connector.
  • 36 pin SFF-8644 Mini SAS HD external plug connector drawing36 pin SFF-8644 Mini SAS HD external receptacle connector drawing
    Mini-SAS HD 4x SFF-8644 external connector the latest HD MiniSAS connector design for implementing HD SAS External interconnect solutions. Typical application is a SAS link between a SAS HBA to a SAS drive subsystem.
  • 36 pin SFF-8643 Mini SAS HD socket connector drawing36 pin SFF-8643 Internal HD Mini SAS plug connector drawing
    Mini-SAS HD SFF-8643 SAS is a serial, point-to-point interfce with SCSI protocol set. Typical application of SFF-8643 connector is a internal SAS link between a SAS HBA to SAS drives.
  • 36 pin Mini-SAS SFF-8087 internal plug connector drawing
    Mini-SAS SFF-8087 internal connector The SFF-8087 connector is widely used on SAS cards. It carries four SATA/ SAS connections providing up to 12gbps of throughput using SAS or SATA II 3.0gbps devices.
  • 52 pin mini-PCIE edge pcb connector drawing
    Mini-SATA (mSATA) connector mSATA applications include netbooks, laptops and other devices that require a solid-state drive in a small footprint.
  • 68 pin U.2 (SFF-8639) SATA Express connector drawing
    OCP Kinetic, SNIA Ethernet Drive SFF-8482 connector 
  • 40 pin IDC male connector drawing40 pin IDC female connector drawing
    P-ATA / IDE interface and cable ATA=AT bus Attachment. Parallel ATA used at the PC, Apple Macintosh and some other computers. Nowdays replaced by SATA.
  • 40 pin IDC female connector drawing50 pin CompactFlash female connector drawing
    Parallel ATA to CompactFlash (CF) adapter 
  • 29 pin SAS drive connector drawing29 pin SAS SFF-8482 drive cable connector drawing
    SAS Serial Attached SCSI (SAS) is a point-to-point serial protocol that moves data to and from computer-storage devices such as hard drives.
  • 32 pin SAS internal SFF-8484 female connector drawing32 pin SAS internal SFF-8484 male edge connector drawing
    SAS 4i internal SFF-8484 The SFF-8484 connectors are commonly found on some older SAS/ SATA controllers, i.e. Dell PERC 5/i, PERC 6i. Nowdays SFF-8484 is mostly superseeded by SFF-8087.
  • 34 pin SFF-8470 Infiniband CX4 female connector drawing
    SAS 4x SFF-8470 Infiniband CX4 external connector some legacy products are using the SFF-8470 connector.
  • 43 pin SAS Multilink SFF-8630 drive plug connector drawing68 pin U.2 (SFF-8639) SATA Express connector drawing
    SAS x4 MultiLink SFF-8630 
  • 7 pin Serial ATA motherboard internal connector drawing
    SATA The Serial ATA (SATA) bus is the serial version of the ATA bus. Primarily used for hard disk connections.
  • 18 pin SATA Express motherboard  connector drawing32 pin SATA Express cable (host receptacle) connector drawing
    SATA Express SATA Express is an interface that supports either SATA or PCI Express storage devices. It is intended for providing a smooth transition path from SATA to PCIe storage.
  • 16 pin (7+9) SATA micro connector drawing
    SATA micro connector 
  • 20 pin SFF-8784 edge connector drawing
    SATA SFF-8784 SFF-8784 edge connector is intended to save space on slim SATA devices
  • 13 pin (7+6) SATA Slimline connector drawing
    SATA Slimline connector 
  • SATA/PATA ZIF connector The connector is used in most SSD and 1.8" hard disk storage devices. The device is connected to the controller via flat ribbon cable.
  • Slimline SAS SFF-8654 connector 
  • 68 pin U.2 (SFF-8639) SATA Express connector drawing
    U.2 connector U.2 (SFF-8639) is a computer interface for connecting SSDs to a computer. It is developed for the enterprise market and designed to support new PCI Express drives along with SAS and SATA drives.
  • ZIF to ATA interface adapter 

Apple Pinouts

  • 48 pin Apple ATA connector drawing
    Apple PowerBook ATA Used on PowerBooks for the 2.5" drives. The internal hard disk has a 48-pin connector that carries both the ATA signals and the power for the drive.

 
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