Freecom TAPEWARE AIT-250I Specification page 80

6.Command Specification
Mode
Fixed Block
Variable Block
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.
Bit 7
Byte
0 PS
1
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:
Page Code
00h Standard Sense
02h Disconnect-Reconnect
0Fh Data Compression Control
10h Device Configuration
11h Medium Partitions Parameter
1Ch Information Exception Control
31h AIT Device Configuration
3Fh Return All Pages
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.
6-28
Fixed Bit in Read, Write & Verify
1
0
Table 6-33: MODE SELECT Page Header
6 5
Reserved
Additional Page Length
Table 6-34: Supported MODE SELECT Page Codes
Description
4 3
Page Code
Parameter List Length
0Ch
0Ch+10h=1Ch
0Ch+10h=1Ch
0Ch+10h=1Ch
0Ch+0Ch=18h ( when AIT bit is ZERO )
0Ch+0Ch=18h
0Ch+0Ah=16h
0Ch+10h+10h+10h+0Ch+0Ah=5Eh
SONY AIT-E Turbo drive SDX-250V series Ver.1.0
MODE SELECT
Block Length in
Mode Select/Sense
Block Size
0
2 1 0
n: Partition Number