SATA-Disk Module 4

APSDMxxxxX5AN-PXXX

8

© 2013 Apacer Technology Inc.

Rev. 1.5

4.4 Endurance

Terabytes Written (TBW) is an endurance rating system that indicates the maximum number of terabytes

written by the host to the drive. NAND flash has a limit on how many P/E cycles it can withstand before its

data retention becomes unreliable. Thus, key factors, such as wear leveling, flash configurations, Write

Amplifications and the number of P/E cycles, can influence the endurance of the drive.

The TBW of the device are listed in the following table.

Notes:

The measurement assumes the data written to the SSD for test is under a typical and constant rate.

The measurement follows the standard metric: 1 TB (Terabyte) = 1000 GB.

4.5 Environmental Specifications

Environmental specification of SDM4 follows military standards, shown in the following table.

Table 4-3 SDM4 environmental specifications

Item

Specification

Operating temperature

0~70(

℃)

Extended temperature

℃)

Storage temperature

-40~100(

℃)

Vibration (non-operating)

10~2000(Hz), 15(G), sine wave, X, Y, Z axis

Vibration (operating)

20~2000(Hz), 7.69 (Grms), random wave, X, Y, Z axis

Shock (non-operating)

1500(G) half-sine wave, ±X, ±Y, ±Z axis

Shock (operating)

50(G), half sine wave, ±X, ±Y, ±Z axis

4.6 Mean Time Between Failures (MTBF)

Mean Time Between Failures (MTBF) is predicted based on reliability data for the individual components

in SDM4.The prediction result for SDM4 is more than 2,000,000 hours.

Notes about the MTBF:

The MTBF is predicated and calculated based on “Telcordia Technologies Special Report, SR-332, Issue

2” method.

Capacity

TBW (TB)

2 GB

96

4 GB

192

8 GB

384

16 GB

769