Fujitsu MBC2036RC SERIES, Руководство по эксплуатации продукта

Страница: 30 / 98

Specifications
26 C141-E266
(2) Mean Time To Repair (MTTR)
MTTR is the average time taken by a well-trained service mechanic to diagnose and repair an HDD
malfunction. The HDD is designed for a MTTR of 30 minutes or less.
(3) Service life
The service life under suitable conditions and treatment is as follows.
The service life is depending on the environment temperature. Therefore, the user must design the
system cabinet so that the average DE surface temperature is as low as possible.
•
DE surface temperature: from 5°C to 40°C 5 years
•
DE surface temperature: from 41°C to 45°C 4.5 years
•
DE surface temperature: from 46°C to 50°C 4 years
•
DE surface temperature: from 51°C to 55°C 3.5 years
•
DE surface temperature: from 56°C to 60°C 3 years
•
DE surface temperature: more than 60°C or No guarantee
less than 5°C (Keep the DE surface temperature
from 5°C to 60°C.)
Even if the HDDs are used intermittently, the longest service life is 5 years.
The maximum storage period without turning the power on is six months.
Note:
The "average DE surface temperature" means the average temperature at the DE surface
throughout the year when the HDDs are operating.
(4)
Data security at power failure
Integrity of the data on the disk is guaranteed against all forms of DC power failure except on blocks
where a write operation is being performed. The above does not applied to formatting disks or
assigning alternate blocks.