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O E M FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" H I G H
6.7 *Mean Time Between Failure (*MTBF)
The mean time to failure target is 1,000,000 device hours per fail (3.0% CDF) based on the following
assumptions:
6000 power on hours per year (500 power on hours per month times 12 months)
300 average on/off cycles per year (25 power cycles per month times 12 months)
Seeking/Reading/Writing is assumed to be 20% of power on hours (Approximately 10 read/write oper-
ations per second)
Operating at or below the Reliability temperature specifications (See Table 15 on page 78) and nominal
voltages (See 2.2, "Power Requirements by Model" on page 15)
Note: *MTBF - is a measure of the failure characteristics over total product life. *MTBF includes normal
integration induced, installation, early life (latent), and intrinsic failures. *MTBF is predicated on supplier
qualification, product design verification test, and field performance data.
6.7.1 Sample Failure Rate Projections
The following tables are for reference only. The tables contain failure rate projections for a given set of user
conditions. Similar projections will be provided, upon request, for each user specific power on hour and
power cycles per month condition. Contact your IBM customer representative for a customized projection.
Application
Electronics only - (RA/MM)
500POH/MM
0.00120
730POH/MM
0.00160
Table 13. Projected failure rates for the electronics only.
Application
Electronics and HDA - (RA/MM)
500POH/MM
0.00150
730POH/MM
0.00200
Table 14.
Projected failure rates for the entire drive. (Electronics and HDA).
6.8 SPQL (Shipped product quality level)
Targets
6.9 Install Defect Free
Source filename=POH
USER RESPONSIBLE F O R VERIFYING VERSION A N D COMPLETENESS
0.0010
0.00140
0.00130
0.00170
LA vintage
.25%
IBM Corporation
0.00096
0.00036
0.00125
0.00047
0.00120
0.00050
0.00160
0.00070
Ultimate (13th month)
.10%
2.1%
2.8%
3.0%
4.1%
Page 75 of 87
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