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SCSI-2 Drive Command Set
Send Diagnostic Command (1DH)
Chapter 22-76
Send Diagnostic Command (1DH)
This command initiates drive diagnostic tests.
NOTE Disconnect must be allowed to run diagnostic tests.
SelfTst A Self-Test bit of 1 causes the poweron selftest to run.
This self-test is equivalent to the execution of test
sequence 1, Poweron Sequence. If this bit is 1, the
Parameter List Length must be 0.
A Self-Test bit of 0 indicates the test requested in the
Parameter List Length (See Table 2-70 on page 2-78)
NOTE A SelfTst bit of 0 should be followed by a Receive Diagnostics Results
Command.
A SelfTst bit of 1 should be followed by a Request Sense Command.
Table 2-67 Send Diagnostic Command CDB
Byte 7 6 5 4 3 2 1 0
0 Operation Code (1DH)
1 Logical Unit Number
(0)
PF (1) Rsvd
(0)
SelfTst DevOfl UnitOfl
2 Reserved (0)
3 Parameter List Length (MSByte)
4 Parameter List Length (LSByte)
5 Reserved (0) Flag Link
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