Page
58
LTO SCSI Interface Manual
Field
Bytes
Bits
Description
DCE
2
7
0 = Data compression is disabled.
1 = Data Compression is Enabled (DCE) (default). The drive com-
presses data before writing to tape.
DCC
2
6
Always 1, indicating that the drive is Data Compression Capable
(DCC).
DDE
3
7
0 = Data decompression is disabled. Compressed data is not de-
compressed before it is transferred to the host.
1 = Data Decompression is Enabled (DDE) (default). The drive de-
compresses compressed data before sending it to the host.
RED
3
5-6
Always 0, indicating that when DDE is 1 and drive is unable to de-
compress compressed data from tape, it should return Check Condi-
tion.
Compres-
sion Algo-
rithm
4-7
0 = Data is not compressed before it is written to tape (even if DCE
is 1).
1 = Default compression algorithm (default).
Decom-
pression
Algorithm
8-11
0 = No algorithm is selected.
1 = Default decompression algorithm is used (default).
Reserved
All reserved bits must be 0.
Sequential Access Device Configuration Page
The Device Configuration page specifies the appropriate sequential access device
configuration. The following table illustrates this page.
Byte
Bits
7
6
5
4
3
2
1
0
0
Reserved
Page Code (10h)
1
Additional Page Length (0Eh)
2
Reserved CAP
CAF
Active Format
3
Active Partition
4
Write Buffer Full Ratio
5
Read Buffer Empty Ratio
6
Write Delay Time, MSB
7
Write Delay Time, LSB
8
DBR
BIS
RSmk
AVC
SOCF
RBO
REW
9
Gap Size
10
EOD Defined
EEG
SEW
Reserved
11
Buffer Size at Early Warning, MSB
12
Buffer Size at Early Warning
13
Buffer Size at Early Warning, LSB
14
Select Data Compression Algorithm
15
Reserved
Field Descriptions
Field
Bytes
Bits
Description
Page Code
0
0-5
10h, indicating the Sequential Access Device Configuration Page.
Additional
Page Length
1
Always 0Eh, indicating that 14 parameter bytes follow the Page
Length byte.
CAP
2
6
Always 0, indicating that multiple partitions are not supported
CAF
2
5
Always 0, indicating that changing formats is not supported
