Chapter 4: SCSI Commands
4-48
July 2004
81-81276-01 Rev A01
4.9.2 MODE SELECT Pages
Following the Command Block Descriptor are the MODE SELECT pages, which set the tape drive
parameters. Each page has a 2-byte header that identifies the page code and indicates the number of
bytes in that page.
Figure 4-31.
MODE SELECT Pages — Data Format
Bit
Byte
7
6
5
4
3
2
1
0
0
PS (0)
0
Page Code
1
Additional Page Length
Table 4-29.
MODE SELECT Pages — Field Descriptions
Field Name
Description
PS
Parameters Savable. For the MODE SELECT command, this bit is reserved. For
the MODE SENSE command, a PS bit of 1 indicates that the tape drive can save
the page in nonvolatile memory. If the PS bit is 0, it cannot save the supported
parameters. The tape drive does not support Savable pages. Byte 0, bit 6 must be 0.
Page Code
These six bits identify the page that follows.
Page Code
01h
02h
0Ah
0Fh
11h
1Ch
3Eh
Description
Read / Write Error Recovery (
Page 4-49
)
Disconnect / Reconnect (
Page 4-51
)
Control Mode (
Page 4-51
)
Data Compression (
Page 4-56
)
Medium Partition (
Page 4-58
)
TapeAlert (
Page 4-60
)
EEPROM Vendor Specific (
Page 4-61
)
Additional Page Length
This bit indicates the number of bytes in that page. However, the value does not
include bytes 0 and 1. The tape drive returns the length on MODE SENSE; the
initiator must subsequently set it to the same value when performing a MODE
SELECT command. If the page length does not match the length the tape drive
expects, the tape drive returns a CHECK CONDITION status with the Sense Key
set to ILLEGAL REQUEST.
The tape drive returns a CHECK CONDITION status with an ILLEGAL
REQUEST Sense Key if it receives an unsupported Page Code or any Page field
with values not supported or changeable. In this case, the command changes no
parameters.
Summary of Contents for DLT1/VS80 SCSI
Page 1: ...DLT1 VS80 SCSI Interface Guide...
Page 6: ...DLT1 VS80 SCSI Interface Guide vi July 2004 81 81276 01 Rev A01 Notes...
Page 12: ...Table of Contents xii July 2004 81 81276 01 Rev A01 Notes...
Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
Page 181: ......
