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Unlike ACPI, BIOS controls most APM power management functions. AOpen Suspend to Hard
Drive is a good example of APM power management.
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ATA is the specification of diskette interface. In 80's, many software and hardware
manufacturers instituted the ATA specification together. The AT is meaning International
Business Machines Corporation (IBM) personal computer/AT's bus structure.
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ATA/66 uses both rising edge and falling edge but doubles
transfer rate is 4 times of the PIO mode 4 or DMA mode 2, 16.6MB/s x4 = 66MB/s. To use
ATA/66, you need special ATA/66 IDE cable.
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ATA/100 is a new IDE specification under developing. ATA/100 uses both rising edge and falling
edge as
ATA/66
but clock cycle time is reduced to 40ns. The data transfer rate is (1/40ns) x 2
bytes x 2 = 100MB/s. To use ATA/100, you need special 80-wire IDE cable, the same as ATA/66.
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UDMA/33
transfer rate. The data
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