Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
119
Format
Description
000b
Block
format
100b
Bytes From Index format
101b
Physical
Sector
format
If the FmtData bit is set to zero, this field must also be zero. Otherwise the command will complete with a CHECK
CONDITION with a sense key of
Illegal Request
and an additional sense code of
Invalid Field in CDB
.
•
Notes:
It is recommended that the MODE SELECT command be issued prior to the FORMAT UNIT command to specify
parameters that affect the formatting process.
The Block Length parameter of the Mode Select Parameter List’s Block Descriptor is used during formatting and is
saved following a successful format operation. If a MODE SELECT command has not been issued since the last reset
or start-up (bring-up) sequence, then the Block Length from the previous format operation is used.
Subsequent to receiving a FORMAT UNIT command, the Target responds to commands as follows:
- All commands except REQUEST SENSE and INQUIRY return
Check Condition
status
,
while the format operation
is an active I/O process.
- When tagged queuing is enabled (DQue = 0), all commands except REQUEST SENSE and INQUIRY return
Queue Full
status
,
while the FORMAT UNIT command is a queued I/O process.
- When tagged queuing is disabled (DQue = 1), all commands except REQUEST SENSE and INQUIRY return
Busy
status
,
while the FORMAT UNIT command is a queued I/O process
- If a REQUEST SENSE command is received while a format operation is an active I/O process, the Target returns
Good
status. The sense key is set to
Not ready
and the additional sense code and qualifier is set to
Format In
Progress
.
- If an INQUIRY command is received while a format operation is an active I/O process, the Target returns
Good
status and Inquiry data as requested.
The format operation must complete successfully for the Drive to be usable. If the command is interrupted by a reset,
power down, or an unrecoverable error, the Drive enters a degraded mode of operation in which reading and writing
are prohibited. To exit the degraded mode, another FORMAT UNIT command must be sent by the Initiator and com-
pleted successfully by the Target.
The FORMAT UNIT command sets the
Unit Attention Condition
for all Initiators except the one that issued the FOR-
MAT UNIT command.
Summary of Contents for Ultrastar 15K450
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