HP Surestore 80fx Optical Drive and Library SCSI-2 Command Reference - Page 84

SCSI-2 Drive Commands NOTE NOTE SCSI-2 Drive Command Set Mode Select Command (15H) Force Verify Bytes 4 and 5 DOM A Force Verify bit of 1 indicates all write operations are verified. The Write 6-, 10-, and 12-byte commands operate as if they were Write Verify 6-, 10-, and 12-byte commands. A Force Verify bit of 0 indicates normal operation. Bytes 4 and 5 are used to read the setting of the DIP switches on the drive. SX-Y refers to the setting of DIP switch S50X-Y (see Figure 2-1 on page 2-51 and Table 2-44 on page 2-51). If SX-Y=0, the switch is set to the OFF position; if SX-Y=1, the switch is set to the ON position. These fields are not changeable. The switch setting value overrides the saved value. A drive operating mode of 0 indicates that the drive is installed in a jukebox environment. A DOM bit of 1 indicates that the drive is installed in a stand-alone environment. The DOM bit is not selectable using the Mode Select command. FWC A Force Write Calibration bit of 1 instructs the drive to perform the Write Calibration routine at spin-up. A Force Write Calibration bit of 0 instructs the drive to perform the Write Calibration routine on receipt of the first Write command or 5 minutes after spin-up. The bits DAIR and Force Verify on this mode page can also be controlled in HP products by changing external switch settings. In HP's standalone box products, this is accomplished by changing the thumb wheel settings on the rear of the box. In HP's library products, this is accomplished by changing the front panel settings. In all cases, changes to the mode page settings will override the external switch settings. Chapter 2 2-47