Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
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20.16.1 Reset Sources
There are four sources of resets detected by the target:
20.16.2 Reset Actions
The action taken by the drive following a reset is dependent on the source of the reset.
20.16.2.1 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
20.16.2.2 SCSI Bus reset and SCSI Target Reset message
These two reset conditions cause the following to be performed.
- If reset goes active while the power-up sequence is in progress, the power-up sequence is started over.
- If the Auto Start pin is grounded and a startup sequence has not yet completed, a startup sequence will be re-
attempted from the beginning.
Note:
The power-up sequence, having already completed, is not rerun.
- If reset occurs while a physical sector is being written, the write operation is disabled after the current physical sec-
tor is written. Data is not lost as long as power stays valid until the physical sector being written is completed.
20.17 Diagnostics
The drive will execute Power on Diagnostics at power on time to assure the correct operation of the drive by validating com-
ponents (ROM, RAM, Sector Buffer, EEPROM, HDC, Spindle Motor, Actuator), checking stored information in the Reserved
Area and EEPROM, and verifying fault detects circuits.
Self-test can be invoked by issuing a SEND DIAGNOSTIC command.
20.17.1 Power on Diagnostics
At power on time the following tests are executed:
1. Validation of ROM and EEPROM
2. RAM test for internal RAM
3. Test and Initialize HDC registers
4. RAM test for Sector Buffer
5. Start Spindle Motor (if Auto spin up enable)
6. Calibration of Actuator
7. Read/Write test for all Heads
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.
SCSI Bus Reset
This is a reset generated when the SCSI bus control line RST goes active.
Target Reset Message
This is the reset generated by the SCSI Target Reset Message (0Ch).
Summary of Contents for HUS151414VL3600
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