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