mtfdaac008saa-1a1 Micron Semiconductor Products, mtfdaac008saa-1a1 Datasheet - Page 16

• Manufacturer Part Number: mtfdaac008saa-1a1
• Description: Nand Flash Solid State Drive
• Manufacturer: Micron Semiconductor Products

Vendor-Specific Commands
S.M.A.R.T. Commands
FORMAT UNIT Command
Table 11:
2.5 PDF: 09005aef82cb3bdc / Source: 09005aef82cb3c5e
realssd_flash_drive__2.fm - Rev. B 5/08 EN
FORMAT UNIT Command
Disk drive manufacturers have incorporated self-monitoring analysis and reporting
technology (S.M.A.R.T.) into their drives to check various performance attributes and to
predict drive failure in time for a system administrator to protect the data on the drive.
With mechanical HDDs, the S.M.A.R.T. system typically monitors, like head flying height
and spin-up time. With SSDs, the S.M.A.R.T. system is used instead to check the number
of bad blocks against the number of remaining spare blocks.
When a Flash block fails, the device automatically transfers the data from the failed
block to a spare block and marks the failed block as bad. When the Flash device leaves
the factory, a small percentage of the total density is reserved as spare blocks. When the
S.M.A.R.T. status is checked by the host on the SSD, the SSD calculates the original num-
ber of spare blocks and the current number of spare blocks. The subcommand RETURN
STATUS returns a status of “passed” if at least 5 percent of the original spare blocks are
still available; otherwise, it returns a “failed” status.
The SSD is shipped from the factory in a low-level format. The FORMAT UNIT (F7h)
command can be used to initiate a new low-level format.
Register
Features
Sector count
Sector number
Cylinder low
Cylinder high
Device/head
Command
7
16
6
Micron Technology, Inc., reserves the right to change products or specifications without notice.
5
4
F7h
2.5-Inch NAND Flash SSD
D
3
Command Definitions
©2007 Micron Technology, Inc. All rights reserved.
2
1
1
Advance
0
1