Справочник Пользователя для Hitachi HDS721032CLA362
Hitachi hard disk drive specifications
96
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.
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.
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.
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
Table 61 Feature Code List