Fujitsu MAN3367FC Manual/User Guide - Page 37

Error rate, CAUTION, Reliability

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2.1 Hardware Specifications (*1) For detail condition, see Section 4.1. (*2) Vibration applied to the drive 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 Vibration displacement should be less than 2.5 mm. (*5) Input voltages are specified at the connector. (*6) High frequency noise 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 medium equally. (1) Unrecoverable error rate Errors which cannot be recovered within 63 retries and ECC correction should not exceed 1 per 1015 bits. CAUTION Data loss For MAN series, Reed Solomon codes are applied for their ECC. The sector-data is divided into 6 interleaving sectors, and ECC is performed in each sector where the maximum number of errors (up to 5 byte) can be corrected. [Total maximum byte: 5 byte × 6 ( interleave) = 30 byte] If the error of read sector keeps allowable error byte number, correction is performed. However, if error byte exceeds its allowable number, correction may not be performed properly. (2) Positioning error rate Positioning errors which can be recovered by one retry should be 10 or less per 108 seeks. 2.1.5 Reliability (1) Mean Time Between Failures (MTBF) MTBF of the IDD during its life time is 1,2000,000 hours (operating: 24 hours/day, 7 days/week average DE surface temperature: 40°C or less). C141-E133-02EN 2-5

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2.1
Hardware Specifications
C141-E133-02EN
2-5
(*1)
For detail condition, see Section 4.1.
(*2)
Vibration applied to the drive 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
Vibration displacement should be less than 2.5 mm.
(*5)
Input voltages are specified at the connector.
(*6)
High frequency noise 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 medium equally.
(1)
Unrecoverable error rate
Errors which cannot be recovered within 63 retries and ECC correction should not exceed 1 per 10
15
bits.
CAUTION
Data loss
For MAN series, Reed Solomon codes are applied for their ECC.
The
sector-data is divided into 6 interleaving sectors, and ECC is
performed in each sector where the maximum number of errors (up to
5 byte) can be corrected. [Total maximum byte: 5 byte
×
6 (
interleave) = 30 byte]
If the error of read sector keeps allowable error byte number,
correction is performed.
However, if error byte exceeds its allowable
number, correction may not be performed properly.
(2)
Positioning error rate
Positioning errors which can be recovered by one retry should be 10 or less per 10
8
seeks.
2.1.5
Reliability
(1)
Mean Time Between Failures (MTBF)
MTBF of the IDD during its life time is 1,2000,000 hours (operating:
24 hours/day, 7 days/week
average DE surface temperature: 40°C or less).