Command Descriptions; Command Descriptions For All Device Types; Group 0 Commands For All Device Types; Test Unit Ready - Seagate ST11200 Product Manual

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5.0

Command descriptions

Two types of commands are supported by the disc drive: commands for all devices; and commands for direct
access devices. In each of these categories the disc drive supports only Group 0, Group 1 and Group 2
commands.
5.1

Command descriptions for all device types

5.1.1

Group 0 commands for All Device Types

The disc drive implements the following Group 0 commands that are applicable for all device types. See
Table 5.1.1-1.
*Byte 0 of Command Descriptor Block.
5.1.1.1 Test Unit Ready (00h)
The Test Unit Ready command provides a means to verify the logical unit is ready. This is not a request for a
self test. If the logical unit (drive) can accept an appropriate medium access command without returning
check condition status, the drive returns a Good status. See Table 5.1.1-2 for proper format.
Bit 7
Byte(s)
0 0
1 Logical Unit No.
0
2 0
3 0
4 0
5 0
Notes.
[1] Logical Unit No. must be zero.
If the drive cannot become operational or is in a state such that an initiator action (e.g., START command) is
required to make the unit ready, the drive returns CHECK CONDITION status with a Sense Key of NOT
READY. One of several possible Additional Sense codes indicates the reason for the NOT READY condition.
Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
Table 5.1.1-1. Group 0 Commands for all device types
Command
OP Code* Command Name
00h

Test Unit Ready

03h Request Sense
12h Inquiry
1Ch Receive Diag.
Results
1Dh Send Diagnostic
Table 5.1.1-2. Test Unit Ready Command
6 5
0 0
0 0
0 0
0 0
0 0
0 0
[2] See "Control Bytes", paragraph 4.2.6.
Applicable
Section
5.1.1.1
5.1.1.2
5.1.1.3
5.1.1.5
5.1.1.6
4 3
0 0
0 0
0 0
0 0
0 0
0 0
2 1
0 0
0 0
0 0
0 0
0 0
0 Flag Link [2]
0
0
0
0
0
0