Sony AIT-SDX470 Product Specifications Manual page 103

MODE SELECT
Bit 7
Byte
0
1
2 WP
3
4
5 (MSB)
6
7
8
9 (MSB)
10
11
Buffered Mode: Buffered Mode is the mechanism by which the drive implements Immediate Reporting on WRITE
commands. The Buffered Mode field is one indicating the drive reports GOOD status on WRITE commands as
soon as the data block has been transferred to the buffer. This is the default configuration for the drive.
Speed: The drive only supports one speed, the default speed. Because of this, this field must be set to ZERO.
Any other value will cause a CHECK CONDITION status with an ILLEGAL REQUEST sense key is returned.
Block Descriptor Length: This specifies the length in bytes of all the block descriptors. Since the drive only
allows one block descriptor, this value must be eight. Any other value will cause a CHECK CONDITION status with
an ILLEGAL REQUEST sense key to be returned. Note: The block descriptor specifies the media characteristics
for the SDX drive. The block descriptor contains the density code, number of blocks and block length fields.
Density Code: The supported values for the density code field are defined in the following table. Note: 00h -
Default: instructs the drive to use its default or only density.
Number of Blocks: A MODE SENSE field which will be returned as ZERO, indicating that all of the remaining
logical blocks on the media will have the medium characteristics specified by the block descriptor, or until a
subsequent MODE SELECT command changes those parameters. This field must be set to ZERO on a MODE
SELECT otherwise a CHECK CONDITION status will be returned with an ILLEGAL REQUEST sense key.
Block length: The Block Length field specifies the length in bytes of each logical block transferred over the bus. A
block length of ZERO indicates that the length is variable. Any other value must be on even boundary and
indicates the fixed block size. This value indicates the number of bytes per block that the drive must handshake
over the bus. This establishes block length such that the transfer length for read, write, and verify type commands
will be a block count, not a byte count.
Note: It is value of this field together with the Fixed Bit Field in the READ, or WRITE commands that determines
whether the drive is in Fixed or Variable block mode. The default fixed block size is 512 bytes.
SONY AIT-1 Turbo drive SDX-470V series Ver.1.0
Table 7-32:MODE PAGE Mode Parameter Header
6 5
Buffered Mode (001b)
Block Descriptor Length (08h)
Number of Blocks (00 00 00h)
Table 7-33: Sequential-Access Density Codes
Page Code
00h
30h
38h
39h
7Fh No change from previous density
7. ATAPI Packet Command Specification
4 3
Reserved
Reserved
Density Code (30h)
Reserved
Block Length
Description
Default Format
AIT-1 Format
AIT-E Turbo Format
AIT-1 Turbo Format
2 1 0
Speed (00h)
(LSSB)
(LSB)
7-31