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MODE SENSE
6.8. MODE SENSE 1Ah
Bit
7
Byte
0
1
Logical Unit Number
2
PCF
3
4
5
Unused (00b)
MODE SENSE provides a means for the drive to report its media, current and changeable configuration parameters
to the host. It is a complementary command to MODE SELECT.
DBD: A Disable Block Descriptors (DBD) bit of ZERO indicates that the target may return ZERO or more block
descriptors in the returned MODE SENSE data at the target's discretion. A DBD bit of one specifies that the target
shall not return any block descriptors in the returned MODE SENSE data.
PCF: The Page Control Field indicates the type of page parameter values to be returned to the Host as shown
below.
Bit 7
Bit 6
Parameter Values
0
0
Current Values
0
1
Changeable Values
1
0
Default Values
1
1
Saved Values
The addition page length field of each page returned by the drive indicates the number of bytes supported for that
page. Fields not supported by the drive are set to ZERO.
Page Code: This allows the Host to select any specific or all pages supported by the drive. The page codes that are
supported are:
Page Code
Description
00h
Standard Sense
02h
Disconnect-Reconnect
0Fh
Data Compression Control
10h
Device Configuration
11h
Medium Partitions Parameter
1Ch
Informational Exception Control
31h
AIT Device Configuration
32h
Append Partition
33h
Delete Partition
3Fh
Return All Pages
If the Host selects any other values, the drive will terminate the command with a CHECK CONDITION status and an
ILLEGAL REQUEST sense key set.
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
6
5
4
Operation Code (1Ah)
Reserved
Allocation Length
Table 6-45: Page Control field values
Description
This is the normal default situation where the drive returns to the
host its current configuration. Page fields not supported are set to
ZERO by the drive.
These are any values which a host may alter in a subsequent MODE
SELECT command. Any field that the drive allows to be changed is
set to one. Otherwise the field is set to ZERO.
These are the default values on power-up
Not supported by the drive
Table 6-46: Supported MODE SENSE Page Codes
0Ch
0Ch+10h=1Ch
0Ch+10h=1Ch
0Ch+10h=1Ch
0Ch+0Ch=18h (when AIT bit is ZERO)
0Ch+(8+ 2xn)=14h+ 2xn(when AIT bit is ONE )
0Ch+0Ch=18h
0Ch+0Ah=16h
0Ch+0Ah=16h (when AIT bit is ONE )
0Ch+0Ah=16h (when AIT bit is ONE )
0Ch+10h+10h+10h+0Ch+0Ch+0Ah=5Eh
0Ch+10h+10h+10h+(8+2xn)+0Ch+0Ah+0Ah+0Ah+06h=74h+2xn
3
2
DBD
Page Code
Reserved
Reserved
Parameter List Length
6.Command Specification
1
0
Reserved
Flag
Link
n : Partition Number
6-57
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