HP C2246 Technical Reference Manual page 48

• Power-On Sequence Sequence. At Power-on, the Target performs the following:
Turn on LED
Microprocessor Self Test
Microprocessor RAM Test
Data Controller Test
ECC Verification Test
Buffer RAM Test, first 64 bytes
Test and Initialize Servo Processor
Initialize SCSI interface
If Auto Spin-Up is not enable.d:
turn off LED and wait for a command
If Auto Spin-Up is enabled:
begin spin-up sequence:
Start spindle motor (See Note below)
Test buffer RAM while spindle is gaining speed
Settle heads on track and calibrate servo system
Perform head alignments
Write/Read Test
Initialize Spare Table
Initialize Logs
Initialize Saved Pages Information
Turn off LED and wait for a command
Note: While the spindle motor is spinning up, the drive will respond to all commands
(except REQUEST SENSE and INQUIRY) with a status byte of Check Condition. The
subsequent REQUEST SENSE command will return a Sense Key Code of Not Ready.
• Data Head Alignment. These drives incorporate the capability to perform periodic
data head alignments. A full head alignment is executed at power-on. Subsequent head
alignments may be executed relative to temperature changes and/ or elapsed time since
power-on.
• Bus Reset. In response to a SCSI bus reset or Bus Device Reset message, the Target will
perform the following:
Turn on LED
Abort Any Command in Progress (reads/writes are aborted at sector boundaries)
Initialize SCSI interface
Initialize Controller
Initialize Spare Table
Initialize Logs
Initialize Saved Pages Information
Turn off LED and wait for a command
4·2 SCSI Interface