User Manual

SCSI Commands Reference Manual, Rev. J 312
www.seagate.com Parameters for direct access devices
5.2.4 Background Scan log page (15h/00h)
The Background Scan log page (see table 278) returns the background scanning status parameter and zero or more Medium
Scan parameters when background scanning is supported. The Background Scan Status parameter provides information about
background pre-scan and background medium scan operations. Each Background Scan log entry corresponds to a logical block
where an error was detected. If the Background Scan log page is filled up, a new Background Scan parameter overwrites the
oldest entry. When a LOG SELECT command with PCR bit set to one is processed all Background Scan parameters are deleted,
however, the values in the Background Scan Status parameter shall not be affected.
Table 277 defines the parameter codes for the Background Scan log page.
The Background Scan log page has the format shown in table 278.
Table 277 Background Scan log page parameter codes
Parameter code Description Resettable or
Changeable
[a]
Reference Support
Required
0000h Background Scan Status parameter Never Mandatory
0001h - 0800h Background Scan parameter Reset
Only
Optional
[b]
8000h - AFFFh Vendor specific n/a Optional
All others Reserved
[a] The keywords in this column -- Always, Reset Only, and Never -- are defined in 5.2.2.3.
[b] If the Background Scan log page is supported, then at least one Background Scan log parameter shall be supported.
Table 278 Background Scan log page
Bit
Byte
7 6 5 4 3 2 1 0
0 DS (1) SPF (0) PAGE CODE (15h)
1 SUBPAGE CODE(00h)
2 (MSB)
PAGE LENGTH (n-3)
3 (LSB)
Background Scan Status log parameter
4
Background Scan Status Parameter (see table 279). . .
19
Background Scan parameter list
20 (MSB)
Background Scan parameter (first) (see table 281). . .
43 (LSB)
. . .
n-23 (MSB)
Background Scan parameter (last) (see table 281). . .
n (LSB)