Idle Time Function; Command Time Out Limits; Reassignment Time; Format Time - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

20.18 Idle Time Function

The drive periodically saves data in logs and PFA counters in the reserved area of the disks. The information is used by the
drive to support various SCSI commands and for the purpose of failure analysis. This is performed if the drive has not received
a SCSI command for 10 minutes.

20.19 Command Time out Limits

The 'Command Time-out Limits' are defined as the time period from the SCSI Arbitration phase through the SCSI Task com-
plete message, associated with a particular command.
The following times are for environments where Automatic Reallocation is disabled and there are no queued commands.

20.19.1 Reassignment Time

The drive should be allowed a minimum of 5 seconds to complete a "Reassign Blocks" command.

20.19.2 Format Time

Approximately 60 minutes should be allowed to complete a "Format Unit" command when certification is disabled. Allow
120 minutes when certification is enabled. If "Fast Format" is enabled via the FFMT bit in mode page 00h, allow 30 seconds
for completion."

20.19.3 Start/Unit Stop Time

The drive should be allowed a minimum of 30 seconds to complete a "Start Stop Unit" command (with Immed bit = 0). Initia-
tors should also use this time to allow startup sequences initiated by auto start ups and "Start Stop Unit" commands (with
Immed bit = 1) to complete and place the drive in a "ready for use" state.
Note: A time-out of one minute or more is recommended but NOT required. The larger system time-out limit allows the
system to take advantage of the extensive ERP/DRP that the drive may attempt in order to successfully complete the startup
sequence.
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
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