Hitachi HUS154530VLF400 User Manual
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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10.0 Reliability
10.1 Start/Stop Cycles
The drive is designed to withstand a minimum of 50,000 start/stop cycles at ambient environment.
The drive is designed to withstand a minimum of 10,000 start/stop cycles at the operating environment conditions specified in
“Environment” on page 25.
“Environment” on page 25.
10.2 Data Reliability
The probability of an uncorrectable data error is 1 in 10
16
bits read.
ECC implementation:
•
1 symbol = 10 bits
•
1 interleave
•
20 symbols, On-The-Fly correction
•
Up to 38 symbols (total) Off-Line correction with burst error information
•
LBA seeded 32 bit CRC for ECC miscorrect detection
10.3 Seek errors
A non-recoverable seek/ID miscompare error is defined as a seek operation that cannot be recovered by the error recovery pro-
cedure of the drive. The drive reports sense key 04 and sense code 02 for this error.
cedure of the drive. The drive reports sense key 04 and sense code 02 for this error.
No drive has more than one non-recoverable seek/ID miscompare error per 100 million seek operations (1 in 1x 10
8
) when
operated at the full range of voltage and environmental conditions.
10.4 Failure prediction (PFA/S.M.A.R.T)
A recoverable equipment error is an error other than a seek/ID miscompare error or read error that is detected and corrected by
the drive error recovery procedure. Examples are Write Fault, Drive Not Ready and internal drive errors.
the drive error recovery procedure. Examples are Write Fault, Drive Not Ready and internal drive errors.
SMART Monitoring Parameters are checked to determine if the (Read/Write/Seek) error rates exceed the drive’s threshold
value when an error occurs and a minimum amount of operation has been completed. A check is also performed for a mini-
mum level of Spare Sector Availability.
value when an error occurs and a minimum amount of operation has been completed. A check is also performed for a mini-
mum level of Spare Sector Availability.
The Head Load / Unload Count, Spin Up Time and Spin Up Retry Count parameters are checked prior to reporting a “Ready”
condition at Power On.
condition at Power On.
Non-recoverable equipment errors indicate a defective drive.
10.5 Preventive Maintenance
None.
10.6 Temperature Warning
Temperature Warning is enabled by setting the EWASC (Enable Warning Additional Sense Code) bit to 1 and setting DEX-
CPT (Disable Exception Control) bit to 0 in Mode Page 1C. For mode page settings, refer to Section 19.10.14, “Mode Page 1C
(Informational Exceptions Control)” on page 193. The warning is issued as sense data (Sense Key 01h, Code 0Bh, Qual 01h).
CPT (Disable Exception Control) bit to 0 in Mode Page 1C. For mode page settings, refer to Section 19.10.14, “Mode Page 1C
(Informational Exceptions Control)” on page 193. The warning is issued as sense data (Sense Key 01h, Code 0Bh, Qual 01h).