7K6000 datasheet(97/274 Pages) WESTERN

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HGST Hard Disk Drive Specification

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

Table 67

Feature Code List

7K6000 Datasheet(PDF) 97 Page - Western Digital Corporation or its affiliates.