Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
316
20.11
Reset
Reset actions will return the drive to a known, initialized state.
This device supports the Hard reset option as defined in the SCSI standards and the reset sources discussed below.
20.11.1
Initiator Sense Data
There are four sources of resets detected by the target:
Reset Name
Reset Source
Power-On Reset
This is the signal generated by the hardware at initial power-on
Self-Initiated reset
This is a software-generated reset that occurs when a catastrophic error is detected by the
microcode.
Hard Reset
This is the Hard Reset performed during a Link Reset Sequence.
LUN Reset
This is a LUN RESET TMF (08h) sent in a TASK IU.
20.11.2
Reset Actions
The action taken by the drive following a reset is dependent on the source of the reset.
20.11.2.1
Power-On reset and Self-Initiated reset
These two reset conditions cause the following to be performed in the order shown:
- A power-up sequence
- A startup sequence is necessary to put the drive in a ready state
These reset conditions cause the following actions:
- If the reset occurs during the power-up sequence, the power-up sequence is re-started.
- If the auto-start option is enabled and a start-up sequence has not yet completed, the start-up sequence is
restarted. Note: The power-up sequence is not re-run, since it has already completed.
- If the reset occurs while a physical sector is being written, the WRITE operation is disabled at the end of the
current sector. The media is not corrupted if power is maintained to the end of the current sector.