Control Mode Page (0Ah) - Maxtor Atlas 10K V Product Manual

Field
Demand Read Re-
tention
Priority
Demand Write Re-
tention
Priority
Disable
Pre-Fetch Transfer
Length
Minimum
Pre-fetch
Maximum
Pre-fetch
Maximum
Pre-fetch
Ceiling
FSW
LBCSS
DRA
VS
Number of Cache
Segments
Cache Segment Size
Non-Cache Segment
Size
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
Bit
Byte
0
1
2
3
5-46 Maxtor Atlas 10K V
Default
Value
This field advises the drive on the retention priority to assign data read into the
0
cache that has also been transferred from the drive to the initiator.
This field advises the drive on the retention priority to assign data written into
0
the cache that has also been transferred from the cache memory to the medium.
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
FFFFh
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.
This field specifies the desired number of sectors to be pre-fetched preceding
0x100
the requested Data.
This field specifies the desired amount of total number of sectors to be pre-
0x200
fetched surrounding the requested data.
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-
0x200
fetch, then the number of logical blocks to pre-fetch is reduced to the value
stored in the maximum pre-fetch ceiling field.
0 The Force Sequential Write bit. Not supported by the drive.
Selects the units of the cache segment Size field. When LBCSS=0, Units are
TBD
bytes per segment. When LBCSS=1, Units are blocks per segment.
When set, the device server will not read into cache any logical blocks beyond
0 the addressed logical block (s). When not set, the device server may continue to
read logical blocks beyond the addressed logical block (s).
The Vendor-Specific bits. Not supported by the drive.
Specifies the number of cache segments to divide the cache into. This field is
variable
used when the Size bit is 0.
Specifies the cache segment size, in either bytes per segment or blocks per seg-
variable ment, depending on the state of the LBCSS bit. This field is used when the Size
bit is 1
0 Not supported by the drive.
Control Mode Page - Data Format (Page 0Ah)
7 6 5
PS Rsvd
Queue Algorithm Modifier
Description
4 3
Page Code (0Ah)
Page Length (0Ah)
Reserved
Re-
served
2 1 0
GLTSD RLEC
Qerr DQue