Reliability Specifications; Error Rates; Read Errors; Environmental Interference - Seagate ST11200N Product Manual

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
6.0

Reliability specifications

The following reliability specifications assume correct host/drive operational interface, including all interface
timings, power supply voltages, and environmental requirements.
Seek Errors
Read Error Rates [1]
Unrecovered Data
Miscorrected Data
MTBF
Service Life
Preventive Maintenance
Note. [1]Error rate specified with automatic retries and data correction with ECC enabled and all flaws
reallocated.
6.1

Error rates

The error rates stated in this specification assume the following:
a. The drive is operated per this specification using DC Power as defined in this specification (see Section
7.2).
b. The drive has been formatted with the SCSI FORMAT commands.
c. Errors caused by media defects or host system failures are excluded from error rate computations.
Refer to Paragraph 8.0, Media Characteristics.
6.1.1

Read errors

Before determination or measurement of read error rates:
a. The data that is to be used for measurement of read error rates must be verified as being written
correctly on the media.
b. All media defect induced errors must be excluded from error rate calculations.
6.1.2

Environmental interference

When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the perfor-
mance of the drive within the system shall be considered acceptable if the drive does not generate an
unrecoverable condition.
An unrecoverable error, or condition, is defined as one that:
1. Is not detected and corrected by the drive itself;
2. Is not capable of being detected from the error or fault status provided through
the drive or SCSI interface; or
3. Is not capable of being recovered by normal drive or system recovery
procedures without operator intervention.
Less than 1 in 10 7 seeks
Less than 1 sector in 10 14 bits transferred
Less than 1 sector in 10 21 bits transferred
200,000 hours
5 years
None required
19