6.Command Specification
MODE SELECT
6-28
SONY AIT-E Turbo drive SDX-250V series Ver.1.0
Mode
Fixed Bit in Read, Write & Verify
Block Length in
Mode Select/Sense
Fixed Block
Variable Block
1
0
Block Size
0
The default fixed block size is 512 bytes however, the drive will accept a variable command (fixed bit of ZERO)
without reporting an error.
Note:
Minimum block-size is 2. If a non ZERO block-size is 1, CHECK CONDITION status will be return, and Sense
Key will be ILLEGAL REQUEST.
Following the Block Descriptor are the MODE SELECT pages. They are the method by which the device parameters
are set. Each page has a two byte header which identifies the page code and indicates the number of bytes in that
page.
Table 6-33: MODE SELECT Page Header
Bit
Byte
7 6 5 4 3 2 1 0
0
PS
Reserved
Page Code
1
Additional Page Length
PS:
when the Page Savable bit is set, this indicates that the page contains saved parameters. This bit will never be
set as there is no non-volatile RAM on the drive into which parameter data may be saved.
The page codes that are supported are:
Table 6-34: Supported MODE SELECT Page Codes
Page Code
Description
Parameter List Length
00h
02h
0Fh
10h
11h
1Ch
Standard Sense
Disconnect-Reconnect
Data Compression Control
Device Configuration
Medium Partitions Parameter
Information Exception Control
0Ch
0Ch+10h=1Ch
0Ch+10h=1Ch
0Ch+10h=1Ch
0Ch+0Ch=18h ( when AIT bit is ZERO )
0Ch+0Ch=18h
31h
AIT Device Configuration
0Ch+0Ah=16h
3Fh
Return All Pages
0Ch+10h+10h+10h+0Ch+0Ah=5Eh
n: Partition Number
Additional Page Length:
Indicates the number of bytes in that page. The value does not, however, include bytes 0
and 1. The length is returned on MODE SENSE and must subsequently be set to the same value when performing
MODE SELECT.
If the page length does not match that expected by the drive a CHECK CONDITION status is returned with the sense
key to set to ILLEGAL REQUEST.
The drive also returns a CHECK CONDITION status with an ILLEGAL REQUEST sense key if the Host sends an
unsupported Page Code, a page field with values that are not supported or are not changeable. In this case, no
parameters will have been changed by the command.
