Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications page 275

- Internal target failures
The drive periodically adjusts the track following for each head to compensate for expansion and contraction of the
disks due to temperature changes. If one of these adjustments fails, the drive will enter a degraded mode to prevent
writing data off track.
Recovery of this condition is either a power cycle or successful completion of the Send Diagnostic (1D). Service the
drive using the recommended service guidelines specified in Section 20.20.1, "Drive Service Strategy" on page 252, if
the power cycle or the Send Diagnostic (1D) command fail to complete successfully.
3. Sense Code/Qualifier of Format Command Failed Format Unit (04), Sense Code/Qualifier of Medium Format Cor-
rupted Reassign Failed Reassign Blocks (07) command, or an automatic reallocation failed or was abnormally termi-
nated.
Recovery from a failed Format Unit (04) is achieved by retrying the command. If the command fails a second time, ser-
vice the drive following the procedure defined in Section 20.20.1, "Drive Service Strategy" on page 252.
If the above defined recovery procedures fail to clear the degraded mode condition, the Drive should be replaced. Follow the
procedure in Section 20.20.1, "Drive Service Strategy" on page 252, when replacing the drive.
20.20.4.7 Reserved Area Hard Error
Sectors found defective in the reserved area of the disk cannot be reassigned after the Drive leaves the factory. The data in the
reserved area is not directly accessible by the initiator. For this reason, the reserved area has duplicate copies of all data. A data
error must occur in both copies of the data record before the Drive considers a reserved area read error. When this happens, the
integrity of the drive is questionable.
Service the Drive using Section 20.20.1, "Drive Service Strategy" on page 252.
20.20.4.8 Interface Protocol
For all interface protocol errors, the initiator should complete the following steps:
1. Correct the parameter that caused the Illegal Request
2. Retry the failing command
3. If the first retry of the failing command completes with
- Good Status, log the error as recovered
- Check Condition Status with sense data for an Illegal Request, verify there is no outside cause (for example, the
power supply) for the failure
- Other, follow the recommendations for the error condition reported. Retry the failing command. If this retry of the
failing command completes with
• Good Status, log the error as recovered
• Check Condition Status with sense data for an Illegal Request, service the drive using the service guideline rec-
ommended in Section 20.20.1, "Drive Service Strategy" on page 252.
• Other, follow the recommendations for the error condition reported.
20.20.4.9 Aborted Command
The initiator should determine the cause from the Additional Sense Code (byte 12):
• Sense Key = B (Aborted Command) with Additional Sense Codes of 1B, 25, 43, 49, and 4E are initiator caused abort
conditions. The initiator should correct the condition that caused the abort and retry the failing command.
• Sense Key = B (Aborted Command) with Additional Sense Code of 44 or 48 are drive caused abort conditions. The
initiator should:
1. Retry the failing command.
2. If the retry of the failing command completes with
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
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