HGST Ultrastar 7K4000 (SAS) Hard Disk Drive Specification
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The WRITE command requests that the drive write data transferred from the initiator to disk. Each logical block transferred
includes user data and may include protection information, based on the WRPROTECT field and the drive format. Each logi-
cal block written includes user data and, if the drive is formatted with protection information enabled, protection information.
If the drive is formatted with type 2 protection (PROT_EN=1 and P_TYPE=001b in the READ CAPACITY (16) parameter
data), then this command will be processed normally. Any other protection types will result in Check Condition status to be
returned with sense key of Illegal Request and additional sense code of Invalid Command Operation Code
The Expected Initial Logical Block Reference Tag field contains the value of the Logical Block Reference Tag field expected
in the protection information of the first logical block accessed by the command.
If the ATO bit is set to one in Mode Page 0Ah, the Logical Block Application Tag Mask field contains a value that is a bit mask
for enabling the checking of the Logical Block Application Tag field in the protection information for each logical block
accessed by the command. A Logical Block Application Tag Mask bit set to one enables the checking of the corresponding bit
of the Expected Logical Block Application Tag field with the corresponding bit of the Logical Block Application Tag field in
the protection information.
If the ATO bit is set to zero, the Logical Block Application Tag Mask field and the Expected Logical Block Application Tag
field are ignored.
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