Seagate ST373454 Manual download pdf (Page 23)

Cheetah 15K.3 SCSI Product Manual, Rev. G 13

5.0 Reliability specifications

The following reliability specifications assume correct host/drive operational interface, including all interface

timings, power supply voltages, environmental requirements and drive mounting constraints (see Section 8.4).

Note.

[1] Error rate specified with automatic retries and data correction with ECC enabled and all flaws reallocated.

5.1 Error rates

The error rates stated in this specification assume the following:

• The drive is operated per this specification using DC power as defined in this manual (see Section 6.2).

• The drive has been formatted with the SCSI FORMAT command.

• Errors caused by media defects or host system failures are excluded from error rate computations. Refer to

Section 3.2, “Media Characteristics.”

• Assume random data.

5.1.1 Environmental interference

When evaluating systems operation under conditions of Electromagnetic Interference (EMI), the performance

of the drive within the system shall be considered acceptable if the drive does not generate an unrecoverable

condition.

An unrecoverable error, or unrecoverable 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 interven-

tion.

5.1.2 Read errors

Before determination or measurement of read error rates:

• The data that is to be used for measurement of read error rates must be verified as being written correctly on

the media.

• All media defect induced errors must be excluded from error rate calculations.

5.1.3 Write errors

Write errors can occur as a result of media defects, environmental interference, or equipment malfunction.

Therefore, write errors are not predictable as a function of the number of bits passed.

If an unrecoverable write error occurs because of an equipment malfunction in the drive, the error is classified

as a failure affecting MTBF. Unrecoverable write errors are those which cannot be corrected by the drive write

error recovery process (excluding media defects).

5.1.4 Seek errors

A seek error is defined as a failure of the drive to position the heads to the addressed track. There shall be no

more than ten recoverable seek errors in 10

physical seek operations. After detecting an initial seek error, the

drive automatically performs an error recovery process. If the error recovery process fails, a seek positioning

Seek Errors

Less than 10 in 10

seeks

Read Error Rates [1]

Recovered Data Less than 10 errors in 10

bits transferred (OEM default settings)

Unrecovered Data Less than 1 sector in 10

bits transferred (OEM default settings)

Miscorrected Data Less than 1 sector in 10

bits transferred

MTBF 1,200,000 hours

Service Life 5 years

Preventive Maintenance None required

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 93 94

Comments to this Manuals

No comments

Seagate ST373454 Manual Page 23

Comments to this Manuals

Related products and manuals for Internal hard drives Seagate ST373454