READ ATTRIBUTE 8Ch
Commands
111
READ ATTRIBUTE 8Ch
The READ ATTRIBUTE command allows an application client to read attribute values to MAM
(Medium Auxiliary Memory). It should be executed before sending a
WRITE ATTRIBUTE command.
Pre-execution checks:
In order to execute a READ ATTRIBUTE command, there must be a cartridge in the drive, even if it is
only partially loaded, so that the MAM can be read.
Command descriptor block:
CDB fields:
Illegal Field Deferred Error Unit Attention Media Access
7 6 5 4 3 2 1 0
0 Operation Code (8Ch)
1 Reserved (0) Service Action
2
Reserved (0)
4
5 Volume Number (0)
6 Reserved (0)
7 Partition Number (0)
8 (MSB)
First Attribute ID
9 (LSB)
10 (MSB)
Allocation Length
13 (LSB)
14 Reserved (0)
15 Control
Service Action Service actions are defined as follows. The data returned for each Service Action is
described below.
Code Name Description
00h Attribute Values Returns the attribute values.
01h Attribute List Returns a list of attribute IDs that are available (both
supported and existing IDs)
02h Volume List Returns a list of known volume numbers. For Ultrium
drives, there is only a single volume, Volume 0.
03h Partition List Returns a list of known partition numbers. For Ultrium
drives, there is only a single partition, Partition 0.
04h–1Fh Reserved
