U S E R RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
O E M F U N C T I O N A L S P E C I F I C A T I O N U L T R A S T A R X P ( D F H C ) SSA M O D E L S 1.12/2.25 G B - 1.0" H I G H
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 |
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Error reporting ³ 99% | All detected errors excluding interface and BATs #1 (Basic Assur- | |
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| ance Test) errors |
Error detection ³ 99% |
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FRU isolation = 100% | T o the device when the "Recommended Initiator Error Recovery | |
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| Procedures" in the Ultrastar X P ( D F H C ) S S A Models Interface |
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| Specification are followed. |
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| N o isolation to |
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6.2 | Data Reliability |
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Probability of not recovering data Recoverable read errors
10 in 1015 bits read
10 in 1013 bits read (measured at nominal D C conditions and room environment with default error recovery — Q P E **)
Probability of miscorrecting unrecoverable data
Note: Eighteen bytes of E C C and two bytes of L R C 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 P F A (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 X P ( D F H C ) S S A Models Interface Specification for the definition of Q P E (Qualify Post Error).
Source filename=RELIABLE | I B M Corporation | Page 73 of 87 |