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Table 108: S.M.A.R.T. read remap data (Feature E0h)
Task File Register
7
6
5
4
3
2
1
0
COMMAND
B0h
DRIVE/HEAD
1
1
1
D
nu
CYLINDER HI
CYLINDER LOW
SECTOR NUM
SECTOR COUNT
FEATURES
C2h
4Fh
nu
04h
E1h
The layout of the returned sectors is, with n the sector number from 0 to 3:
Table 109: Replacement block information
Offset
0..1
2..3
…
508..509
510..511
Value
Description
Number of flash blocks that have wear level class 256*n+0
Number of flash blocks that have wear level class 256*n+1
…
Number of flash blocks that have wear level class 256*n+254
Number of flash blocks that have wear level class 256*n+255
i.e. the first sector returns the information for wear level classes 0 to 255, the second sector returns the
information for wear level classes 256 to 511, and so on.
A block moves from one wear level class into the next when it reaches the number of erases that is
specified as the “Wear Level Threshold” in the preformat. A common threshold number is 4095, this means
that blocks in wear level class 0 have seen 0 to 4095 erases, blocks in wear level class 1 have seen 4096 to
8191 erases, and so on. Using this information, statements about the wear of the card, and of the estimated
remaining life can be made. The useful range of wear level classes is 0 to 1022, class 1023 has blocks that are
not subject to wear leveling, like the Anchor block.
Swissbit AG
Industriestrasse 4
Swissbit reserves the right to change products or specifications without notice.
Revision: 1.00
CH-9552 Bronschhofen
Switzerland
www.swissbit.com
industrial@swissbit.com
P-120_data_sheet_PA-QxBO_Rev100.doc
Page 67 of 76
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