APSDM002G15AN-ATW Apacer, APSDM002G15AN-ATW Datasheet - Page 11

• Manufacturer Part Number: APSDM002G15AN-ATW
• Description: Solid State Drives - SSD SDM3 22P/90D SATA DISK MOD SLC 2GB ET
• Manufacturer: Apacer

Specifications of APSDM002G15AN-ATW

• Rohs: yes
• Product: SATA Disk Modules
• Memory Size: 2 GB
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Dimensions: 44 mm x 30 mm x 1.6 mm
• Minimum Operating Temperature: - 40 C

SATA-Disk Module 4
APSDMxxxx15Ax-AXX
5.6 S.M.A.R.T.
S.M.A.R.T. is an acronym for Self-Monitoring, Analysis and Reporting Technology, an open standard
allowing disk drives to automatically monitor their own health and report potential problems. It protects the
user from unscheduled downtime by monitoring and storing critical drive performance and calibration
parameters. Ideally, this should allow taking proactive actions to prevent impending drive failure.
Apacer SDM4 uses the standard SMART command B0h to read data from the drive for SMART feature
as the SATA Rev.2.6 ATA/ATAPI-7 specifications. Based on the SFF-8035i Rev. 2.0 specifications,
Apacer SMART defines vendor-specified SMART Attribute IDs (A0h, A1h, A2h, A3h, A4h-A5h) in SDM4.
They represent initial back block count, bad block count, spare block count, maximum erase count, and
average erase counts respectively. When the Apacer SMART Utility running on the host, it analyzes and
reports the disk status to the host before SDM4 is in critical condition.
5.7 TRIM
Made of millions of NAND flash cells, SSD can be written into groups called pages in 4K size generally,
but can only be erased in larger groups called blocks of 128 pages or 512KB. These stipulations are
partially the source of many performance issues. Until an address gets used again, the SSD has to keep
track of every last bit of data that’s written on it. The ATA-TRIM instruction tilts the balance in favor of the
SSD. TRIM addresses a major part of the performance degradation issue over time that plagues all SSDs.
A TRIM enabled drive running an OS with TRIM support will stay closer to its peak performance over time.
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© 2011 Apacer Technology Inc.
Rev. 1.0