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Table 59 Feature Code List
Feature Code
State Definition
0001h
0001h: Allow write cache operation to be determined by Set Feature command
0002h: Force write cache enabled
0003h: Force write cache disabled
If State 0001h is selected, the ATA Set Feature command will determine the operation state of
write cache. If State 0002h or 0003h is selected, write cache will be forced into the
corresponding operation state, regardless of the current ATA Set Feature state. Any attempt to
change the write cache setting through Set Feature shall be accepted, but otherwise ignored,
and not affect the operation state of write cache and complete normally without reporting an
error.
In all cases, bit 5 of Word 85 in the Identify Device information will reflect the true operation
state of write cache, one indicating enabled and zero indicating disabled.
The default state is 0001h.
0002h
0001h: Enable Write Cache Reordering
0002h: Disable Write Cache Reordering
The default state is 0001h.
The drive does not return error for setting state 0002h, but the state is ignored.
0003h
Set time interval for temperature logging.
0000h is invalid.
0001h to FFFFh logging interval in minutes.
This value applies to the Absolute HDA Temperature History queue. Issuing this command will
cause the queue to be reset and any prior values in the queue will be lost. Queue Index shall
be set to zero and the first queue location will be set to the current value. All remaining queue
locations are set to 80h. The Sample Period, Max Op Limit, Over Limit, Min Op Limit and Under
Limit values are preserved.
Default value is 0001h.
0004h-CFFFh
Reserved
D000h-FFFFh Vendor Specific
98
Hard Disk Drive Specification