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OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" HIGH
6.0 Reliability
Note: The reliability projections are based on the conditions stated below. All of the SSA models will meet
the projections as long as reliability operating conditions are not exceeded.
6.1 Error Detection
Error reporting ≥ 99% All detected errors excluding interface and BATs #1 (Basic Assur-
ance Test) errors
Error detection ≥ 99%
FRU isolation = 100% To the device when the "Recommended Initiator Error Recovery
Procedures" in the Ultrastar XP (DFHC) SSA Models Interface
Specification are followed.
No isolation to sub-assemblies within the device are specified.
6.2 Data Reliability
Probability of not recovering data 10 in 10
15
bits read
Recoverable read errors 10 in 10
13
bits read (measured at nominal DC conditions and room
environment with default error recovery —QPE
**
)
Probability of miscorrecting unrecoverable data
Note: Eighteen bytes of ECC and two bytes of LRC are provided for each data block.
6.3 Seek Error Rate
The drives are designed to have less than 10 errors in 10,000,000 seeks. In the field, a seek error rate of 40 in
100, 000 seeks will trip PFA (Predictive Failure Analysis) error.
The drives are designed to achieve Soft Seek Error rate of 1 error in 100,000,000 seeks.
6.4 Power On Hours Examples:
Maximum power on hours (with minimum power on/off cycles)
43,800 hours for life based on:
- 5 Power on/off cycles per month
- 730 power on hours per month
Nominal power on hours (with nominal power on/off cycles)
30,000 hours for life based on:
**
Refer to Ultrastar XP (DFHC) SSA Models Interface Specification for the definition of QPE (Qualify Post Error).
Source filename=RELIABLE IBM Corporation Page 73 of 87