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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.
Moving the HDD controller from the interface card to the disk drive helped to standardize the host/controller interface, reduce the programming complexity in the host device driver, and reduced system cost and complexity. The 40-pin IDE/ATA connection transfers 16 bits of data at a time on the data cable.
Parallel ATA (then simply called ATA or IDE) became the primary storage device interface for PCs soon after its introduction. In some systems, a third and fourth motherboard interface was provided, allowing up to eight ATA devices to be attached to the motherboard. Often, these additional connectors were implemented by inexpensive RAID controllers.
Depending on the implemented BIOS and configuration the IT8212F functions in either a RAID or an ATAPI mode, supporting up to four devices using dual channels. The raid mode only supports IDE Hard Disk Drives and includes RAID 0 , RAID 1 , Raid 0+1 and JBOD , along with a "normal" mode that essentially acts as a standard Hard Disk controller.
SCSI technology advantages include allowing up to 15 devices on one bus, independent data transfers, hot-swapping, much higher MTBF. Around 1997, with the introduction of ATAPI-4 (and thus Ultra-DMA-Mode, which enabled fast data transfers with less CPU utilization) the first ATA RAID controllers were introduced as PCI expansion cards. Those ...
SCSI / ATA Translation (SAT) is a set of standards developed by the T10 subcommittee, defining how to communicate with ATA devices through a SCSI application layer. The standard attempts to be consistent with the SCSI architectural model , the SCSI Primary Commands, and the SCSI Block Commands standards.
ATAPI over Parallel ATA: ATA Packet Interface T13 / NCITS 317-1998 at the Wayback Machine (archived 2013-12-15) 16 33 MHz DDR: none 133 MB/s [k] (1,064 Mbit/s) 457 mm (18 inches) 2 ATAPI over Serial ATA: serial 6 Gbit/s 8b10b 600 MB/s [l] (4,800 Mbit/s) 1 m 1 (15 with port multiplier) iSCSI: Internet Small Computer System Interface, SCSI over IP
Standard Version Released American Standard Code for Information Interchange: Atom: 1.0 Cascading Style Sheets (CSS) 2.1 2007/07/19 COLLADA: 1.5.0 [11] 2008/08 Common Information Model (CIM) 2.22 2009/06/25 Common Gateway Interface (CGI) 1.1 DocBook: 5.0 ECMAScript: 5.1 2011/06 Executable and Linking Format (ELF) 1.2 File Transfer Protocol (FTP)