ATAPI
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ATAPI (ATA Packet Interface) is a protocol used with the
ATAPI devices include CD-ROM and
History
ATA was originally designed for, and worked only with, hard disks and devices that could emulate them. A group called the
The Small Form Factor committee approached this problem by defining ATAPI as part of the fourth generation of ATA. ATAPI carries SCSI commands through ATA, so ATAPI devices are "speaking SCSI" other than at the electrical interface. In fact, some early ATAPI devices were simply SCSI devices with an ATA/ATAPI to SCSI protocol converter added on. The SCSI commands and responses are embedded in "packets" (hence "ATA Packet Interface") for transmission on the ATA cable. This interfaces ATA with any device class for which a SCSI command set has been defined. ATAPI devices are also "speaking ATA" because the ATA physical interface and protocol are still being used to send the packets.
The
Specification
The SCSI commands and responses used by each class of ATAPI device (CD-ROM, tape, etc.) are described in other documents or specifications specific to those device classes and are not within ATA/ATAPI or the
ATAPI was adopted as part of ATA in INCITS 317-1998, AT Attachment with Packet Interface Extension (ATA/ATAPI-4).[1]
See also
- SCSI / ATA Translation – Computer device communications standard
References
- ^ Technical Committee T13 AT Attachment (1998). AT Attachment with Packet Interface Extension (ATA/ATAPI-4). Global Engineering Documents.
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External links
- Necasek, Michal (24 November 2021). "The Secret History of ATAPI". OS/2 Museum. Retrieved 25 November 2021.