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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
6.0
6.1
6.1.1
6.1.2
Reliability specifications
The following reliability specifications assume correct host and drive opera-
tional interface, including all interface timings, power supply voltages, and
environmental requirements.
Seek error rate
Recoverable error rate
Unrecovered data
Miscorrected data
MTBF
Service life
Preventive maintenance
Error rates
The error rates stated in this manual assume the following:
• The drive is operated per this manual using DC power as defined in
Section 7.2.
• The drive has been formatted with the SCSI format commands.
• Errors caused by media defects or host system failures are excluded
from error rate computations. Refer to Section 9.0, "Defect and error
management."
Environmental interference
When evaluating systems operation under conditions of electromagnetic
interference (EMI), the performance of the drive within the system is
considered acceptable if the drive does not generate an unrecoverable
condition.
An unrecoverable error or condition is defined as one that:
• is not detected and corrected by the drive itself;
• is not capable of being detected from the error or fault status provided
through the drive or SCSI interface; or
• is not capable of being recovered by normal drive or system recovery
procedures without operator intervention.
Write errors
Write errors can occur as a result of media defects, environmental interfer-
ence, or component malfunction. Therefore, write errors are not predictable
as a function of the number of bits passed.
If an unrecoverable write error occurs because of a component malfunction
in the drive, the error is classified as a failure affecting MTBF. Unrecoverable
write errors are those that cannot be corrected within two attempts at writing
the record with a read verify after each attempt (excluding media defects).
Less than 10 errors in 10
Less than 10 errors in 10
(using default settings)
Less than 1 sector in 10
Less than 1 sector in 10
800,000 hours
5 years
None required
21
8
seeks
11
bits transferred
14
bits transferred
21
bits transferred
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