HP 220mx Optical Drive and Library SCSI-2 Command Reference - Page 372

Disconnect Timeout Settings Disconnect Timeout Settings a. If the Read Element Status Command disconnects, it will perform movements identical to that of the Initialize Element Status before sending the element status data. Therefore, the timeout should be set the same as the Initialize Element Status command. b. The Send Diagnostic Command is different from the other commands in that there are a number of different tests that may be executed. Also, the test may be run in a loop. It is recommended that the host never run a diagnostic test in a loop so set the loop count to one and set the timeout to 10 minutes. Disconnect Timeouts Appendix E E-3