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5.3 Host Commands
C141-E239 5-65
• Checksum
Two’s complement of the lower byte, obtained by adding 511-byte data one byte
at a time from the beginning.
• Guarantee failure threshold
The limit of a varying attribute value. The host compares the attribute values
with the thresholds to identify a failure.
Table 5.18 Log Directory Data Format
Byte Item
00
01
SMART Logging Version
02 Number of sectors of Address "01h"
03
Reserved
04
Number of sectors of Address "02h"
05 to 0B
Reserved
0C Number of sectors of Address "06h"
0D to 11 Reserved
12 Number of sectors of Address "09h"
13 to FF Reserved
100 Number of sector
101
Address 80h
Reserved
102 to 13F
Address 81h
to
Address 9Fh
"102" and "13F" are both the same
format as "100-101"
140 to 1FF Reserved
• SMART error logging
If the device detects an unrecoverable error during execution of a command
received from the host, the device registers the error information in the SMART
Summary Error Log (see Table 5.19) and the SMART Comprehensive Error Log
(see Table 5.20), and saves the information on media.
The host issues the SMART Read Log Sector sub-command (Features field = D5h,
Sector Number field = 01h, Sector Count field = 01h) and can read the SMART
Summary Error Log.
The host issues the SMART Read Log Sector sub-command (Features field =
D5h, Sector Number field = 02h, Sector Count field = 33h) and can read the
SMART Comprehensive Error Log.