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SCSI Commands
5-164
Quantum DLT 8000 Tape System
READ BLOCK LIMITS Command (05h) (continued)
The READ BLOCK LIMITS data shown below is sent during the DATA IN phase of the
command. The command does not reflect the currently selected block size, only the
available limits. MODE SENSE is the command that returns the current block size.
Bit
Byte
7
6
5
4
3
2
1
0
0
Reserved *
1 - 3
(MSB)
Maximum Block Length
(LSB)
4 - 5
(MSB)
Minimum Block Length (0001h)
(LSB)
*
In SCSI-3 configurations, Byte 0 appears as shown below:
0
Reserved
Granularity
The
Granularity
field is described in the table below.
Figure 5–73 READ BLOCK LIMITS Data — Data Format
Table 5–73 READ BLOCK LIMITS Data — Field Descriptions
Field Name
Description
Granularity
(SCSI-3 Only)
This field indicates the supported block size granularity. The DLT
8000 tape drive supports all block sizes
n
such that
n
minus the
minimum block length limit is a multiple of 2
x
(where
x
is the value in
the Granularity bits), and
n
is greater than or equal to the Minimum
Block Length Limit and less than or equal to the Maximum Block Size
Limit. For the DLT 8000 system, the content of the Granularity field is
1 (since block sizes must be a multiple of 2; 2
1
= 2).
For backward compatibility, the DLT 8000 will process requests that
do not meet Granularity criteria, except for Odd-byte Multiple Block
Fixed Block WRITE commands when connected to a Wide (16-bit)
SCSI bus.
Maximum Block Length
The value in this field indicates the maximum block size. The tape
drive supports a maximum block length of 16,777,214 (16 MB-2) for
10, 15,20, 35, or 40 GB format.
Minimum Block Length
The value in this field indicates the minimum block size. The tape
drive supports a minimum block length of 2 bytes.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
Page 6: ......
Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
Page 102: ......
Page 372: ......
Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
Page 407: ......