Hardware Reference
In-Depth Information
ATA-1 (ATA Interface for Disk Drives)
ATA-1 defined the original ATA interface, which was an integrated bus interface between
disk drives and host systems based on the ISA (AT) bus. These major features were intro-
duced and documented in the ATA-1 specification:
• 40/44-pin connectors and cabling
• Master/slave or cable select drive configuration options
• Signal timing for basic Programmed I/O (PIO) and direct memory access (DMA)
modes
• Cylinder, head, sector (CHS) and logical block address (LBA) drive parameter trans-
lations supporting drive capacities up to 2 28 −2 20 (267,386,880) sectors, or 136.9GB
Although ATA-1 had been in use since 1986, work on turning it into an official standard
began in 1988 under the Common Access Method (CAM) committee. The ATA-1 stand-
ard was finished and officially published in 1994 as “ANSI X3.221-1994, AT Attachment
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