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5-46 Maxtor Atlas 10K V
5.12.10 Control Mode Page (0Ah)
The Control Mode page controls the drive’s command processing and error handling
policies. The data format and field descriptions are described in Table 5-68 and Table
5-69 respectively.
Table 5-68 Control Mode Page - Data Format (Page 0Ah)
Demand Read Re-
tention
Priority
0
This field advises the drive on the retention priority to assign data read into the
cache that has also been transferred from the drive to the initiator.
Demand Write Re-
tention
Priority
0
This field advises the drive on the retention priority to assign data written into
the cache that has also been transferred from the cache memory to the medium.
Disable
Pre-Fetch Transfer
Length
FFFFh
This field specifies the selective disabling of anticipatory pre-fetch
on long transfer lengths. The value in this field is compared to the number of
sectors requested by the current READ command. If the number of sectors is
greater the than the value specified, anticipatory pre-fetch is not performed for
the command. When 0, anticipatory pre-fetch is disabled.
Minimum
Pre-fetch
0x100
This field specifies the desired number of sectors to be pre-fetched preceding
the requested Data.
Maximum
Pre-fetch
0x200
This field specifies the desired amount of total number of sectors to be pre-
fetched surrounding the requested data.
Maximum
Pre-fetch
Ceiling
0x200
Specifies an upper limit on the number of logical blocks computed as the max-
imum pre-fetch. If this number of sectors is greater than the maximum pre-
fetch, then the number of logical blocks to pre-fetch is reduced to the value
stored in the maximum pre-fetch ceiling field.
FSW 0 The Force Sequential Write bit. Not supported by the drive.
LBCSS TBD
Selects the units of the cache segment Size field. When LBCSS=0, Units are
bytes per segment. When LBCSS=1, Units are blocks per segment.
DRA 0
When set, the device server will not read into cache any logical blocks beyond
the addressed logical block (s). When not set, the device server may continue to
read logical blocks beyond the addressed logical block (s).
VS The Vendor-Specific bits. Not supported by the drive.
Number of Cache
Segments
variable
Specifies the number of cache segments to divide the cache into. This field is
used when the Size bit is 0.
Cache Segment Size variable
Specifies the cache segment size, in either bytes per segment or blocks per seg-
ment, depending on the state of the LBCSS bit. This field is used when the Size
bit is 1
Non-Cache Segment
Size
0 Not supported by the drive.
Bit
Byte
765432 1 0
0 PS Rsvd Page Code (0Ah)
1 Page Length (0Ah)
2 Reserved GLTSD RLEC
3 Queue Algorithm Modifier
Re-
served
Qerr DQue
Field
Default
Value
Description