Fujitsu MBB2073RC User Manual download pdf (Page 29)

2.1 Hardware Specifications

(*1) For detail condition, see Section 4.1.

(*2) Vibration applied to the HDD is measured at near the mounting screw hole on the frame as much

as possible.

(*3) At random seek write/read and default on retry setting with log sweep vibration.

(*4) At power-off state after installation

(*5) Input voltages are specified at the HDD connector side, during HDD Idle state.

(*6) Operating currents are values under random W/R operation of full partition at about 220 IOPS.

(*7) High frequency noise (over 20MHz) is less than 100 mVp-p.

2.1.4 Error rate

Errors detected during initialization and replaced by alternate block assignments are not included in

the error rate. Data blocks to be accessed should be distributed over the disk equally.

(1) Unrecoverable error rate

Errors which cannot be recovered within 63 retries and ECC correction should not exceed 10 per 10

bits read.

(2) Positioning error rate

Positioning errors which can be recovered by one retry should be 10 or less per 10

seeks.

2.1.5 Reliability

(1) Mean Time Between Failures (MTBF)

MTBF of the HDDs during its life time is 1,400,000 hours (operating: 24 hours/day, 7 days/week

average DE surface temperature: 50°C or less). Continual or sustained operation at case DE surface

temperature above 50°C may degrade product reliability.

Note:

The MTBF is defined as:

Operating time (hours) at all field sites

MTBF =

The number of equipment failures from all field sites

Failure of the equipment means failure that requires repair, adjustments, or replacement.

Mishandling by the operator, failures due to bad environmental conditions, power trouble, host

system trouble, cable failures, or other failures not caused by the equipment are not considered.

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Fujitsu MBB2073RC User Manual Page 29