Hitachi HTS548040M9AT00 Specifications page 165

Note 1. When the Feature register is 03h (= Set Transfer mode) the Sector Count Register specifies the transfer
mechanism. The upper 5 bits define the type of transfer and the low order 3 bits encode the mode value.
PIO Default Transfer Mode
PIO Default Transfer Mode, Disable IORDY
PIO Flow Control Transfer Mode X
Multiword DMA mode x
Ultra DMA mode x
When the Feature Register is 05h (=Enable Advanced Power Management) the Sector Count Register specifies the
Advanced Power Management level.
C0h-FEh
80h-BFh
01h-7Fh
00h, FFh
Note 2. If the number of auto reassigned sectors reaches the device's reassignment capacity, the write cache func-
tion will be automatically disabled. Although the device still accepts the Set Features command (with Feature reg-
ister = 02h) without error, the write cache function will remain disabled. For the current write cache function status,
refer to the Identify Device Information (129 word) by the Identify Device command.
Hard reset or power off must not be done during the first 5 seconds after write command completion when write
cache is enabled.
Note 3. When the Feature register is 85h (=Disable Advanced Power Management), the deepest Power Saving
mode becomes Active Idle.
00000 000
00000 001
00001 nnn (nnn=000,001,010,011,100)
00100 nnn (nnn=000,001,010)
01000 nnn (nnn=000,001,010,011,100)
The deepest Power Saving Mode is Active Idle
The deepest Power Saving Mode is Low Power Idle
The deepest Power Saving Mode is Standby
Aborted
Travelstar 5K80 Hard Disk Drive Specification
149