HP Surestore 125ex Optical Drive and Library SCSI-2 Command Reference - Page 113
Send Diagnostic Command (1DH),
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SCSI-2 Drive Command Set Send Diagnostic Command (1DH) Send Diagnostic Command (1DH) This command initiates drive diagnostic tests. NOTE Table 2-67 Disconnect must be allowed to run diagnostic tests. Send Diagnostic Command CDB Byte 7 6 5 4 3 2 1 0 0 Operation Code (1DH) 1 Logical Unit Number PF (1) Rsvd SelfTst DevOfl UnitOfl (0) (0) 2 Reserved (0) 3 Parameter List Length (MSByte) 4 Parameter List Length (LSByte) 5 Reserved (0) Flag Link 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. 2-76 Chapter 2