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The SEND DIAGNOSTIC command directs the tape drive to perform its self-
diagnostic tests. It can also be used to invoke the Basic Health Check (BHC)
diagnostic test. Note that the BHC feature is provided for use only by a trained
service provider.
Bit
Byte
76543210
0 Operation Code (1Dh)
1 Logical Unit Number PF (0) Rsv’d Selftst DevOfl UnitOfl
2 Reserved
3 - 4 (MSB) Reserved (LSB)
5 Unused Reserved Flag Link
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PF Page Format. Not supported; must be 0.
Selftst Self Test. This bit is used in conjunction with DevOfl and UnitOfl to
specify the type of testing to be done. An explanation is provided in the
following paragraphs.
DevOfl Device Offline. This bit is used in conjunction with Selftst and UnitOfl to
specify the type of testing to be done. An explanation is provided in the
following paragraphs.
UnitOfl Unit Offline. This bit is used in conjunction with Selftst and DevOfl to
specify the type of testing to be done. An explanation is provided in the
following paragraphs.
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