Interface standard for the connection of storage devices
This article is about the computer storage adapter. For the telephone adapter, see Analog telephone adapter.
Parallel ATA
Two ATA motherboard sockets above, with an ATA connector below
Type
Internal storage device connector
Production history
Designer
Western Digital and Compaq, subsequently enhanced by many others
Designed
1986
Superseded by
Serial ATA (2003)
General specifications
Hot pluggable
No
External
No
Cable
40 or 80 conductor ribbon cable
Pins
40
Data
Width
16 bits
Bitrate
Half-duplex: 8.3 MB/s per ATA channel originally later 33, 66, 100 and 133 MB/s per ATA channel
Max. devices
Two
Protocol
Parallel
Pinout
Pin 1
Reset
Pin 2
Ground
Pin 3
Data 7
Pin 4
Data 8
Pin 5
Data 6
Pin 6
Data 9
Pin 7
Data 5
Pin 8
Data 10
Pin 9
Data 4
Pin 10
Data 11
Pin 11
Data 3
Pin 12
Data 12
Pin 13
Data 2
Pin 14
Data 13
Pin 15
Data 1
Pin 16
Data 14
Pin 17
Data 0
Pin 18
Data 15
Pin 19
Ground
Pin 20
Key or VCC_in
Pin 21
DDRQ
Pin 22
Ground
Pin 23
I/O write
Pin 24
Ground
Pin 25
I/O read
Pin 26
Ground
Pin 27
IOCHRDY
Pin 28
Cable select
Pin 29
DDACK
Pin 30
Ground
Pin 31
IRQ
Pin 32
No connect
Pin 33
Addr 1
Pin 34
GPIO_DMA66_Detect
Pin 35
Addr 0
Pin 36
Addr 2
Pin 37
Chip select 1P
Pin 38
Chip select 3P
Pin 39
Activity
Pin 40
Ground
Parallel ATA (PATA), originally AT Attachment, also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible computers. It was first developed by Western Digital and Compaq in 1986 for compatible hard drives and CD or DVD drives. The connection is used for storage devices such as hard disk drives, floppy disk drives, optical disc drives, and tape drives in computers.
The standard is maintained by the X3/INCITS committee.[1] It uses the underlying AT Attachment (ATA) and AT Attachment Packet Interface (ATAPI) standards.
The Parallel ATA standard is the result of a long history of incremental technical development, which began with the original AT Attachment interface, developed for use in early PC AT equipment. The ATA interface itself evolved in several stages from Western Digital's original Integrated Drive Electronics (IDE) interface. As a result, many near-synonyms for ATA/ATAPI and its previous incarnations are still in common informal use, in particular Extended IDE (EIDE) and Ultra ATA (UATA). After the introduction of SATA in 2003, the original ATA was renamed to Parallel ATA, or PATA for short.
Parallel ATA cables have a maximum allowable length of 18 in (457 mm).[2][3] Because of this limit, the technology normally appears as an internal computer storage interface. For many years, ATA provided the most common and the least expensive interface for this application. It has largely been replaced by SATA in newer systems.
^"t13.org".
^"Serial ATA: A Comparison with Ultra ATA Technology" (PDF). Seagate Technology. Archived from the original (PDF) on 2012-01-05. Retrieved 23 January 2012.
^Frawley, Lucas. "Parallel vs. Serial ATA". What Is? The Information for Your Computer Questions. Directron.com. Archived from the original on 1 August 2003. Retrieved 23 January 2012.
ParallelATA (PATA), originally AT Attachment, also known as Integrated Drive Electronics (IDE), is a standard interface designed for IBM PC-compatible...
drives. Serial ATA succeeded the earlier ParallelATA (PATA) standard to become the predominant interface for storage devices. Serial ATA industry compatibility...
bus types, including parallelATA (PATA, also called IDE or EIDE; described before the introduction of SATA as ATA), Serial ATA (SATA), SCSI, Serial Attached...
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ATAPI (ATA Packet Interface) is a protocol used with the ParallelATA (IDE) and Serial ATA standards so that a greater variety of devices can be connected...
links being used in favor of parallel links; for example, IEEE 1284 printer ports vs. USB, ParallelATA vs. Serial ATA, and FireWire or Thunderbolt are...
computer. ParallelATA Serial ATA AT Attachment with Packet Interface - 7 Volume 2 - Parallel Transport Protocols and Physical Interconnect (ATA/ATAPI-7...
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bundles even featured a full SCSI bus. Modern IDE/ATAPI compliant ParallelATA and Serial ATA drive control chipsets and their interface technology is more...
SATA protocol or through SAS expanders using Serial ATA Tunneling Protocol (STP). Both SAS and parallel SCSI use the SCSI command set. There is little physical...
identifier used in storage technologies including Fibre Channel, ParallelATA, Serial ATA, SCSI and Serial Attached SCSI (SAS). A WWN may be employed in...
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acquisition of ATI. A-Link Express III is essentially PCIe 2.0 x4 lanes. 1 ParallelATA, also known as Enhanced IDE supports up to 2 devices per channel. All...
partition's first sector address. Then, for a disk drive connected via ParallelATA, each of them must be converted to logical cylinder-head-sector address...
preceded by ParallelATA's version of Tagged Command Queuing (TCQ). ATA's attempt at integrating TCQ was constrained by the requirement that ATA host bus...
Electronics, a computer hardware bus for disk drives, retroactively termed ParallelATA Ide, Devon, a village in England Ide, Kyoto, a town in Japan Ida (mother...
this size was used in floppy-disk-drive cables and older or custom ParallelATA cables. Based on availability of standard connectors, the number of conductors...
migrated towards replacing parallel buses with serial buses, for example by the evolution of Serial ATA replacing ParallelATA, PCI Express replacing PCI...
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