Seagate CD72LWH Product Manual page 27

Installation
Media-Recognition System (Switch 3)
Power-on Self-Test Enable/Disable (Switch 4)
Operating System Configuration (Switches 5 through 8)
SCSI Wide/Narrow (Switch 9)
Inquiry String Switch (Switch 10)
The media-recognition system allows the drive to determine whether a given tape
cartridge conforms to the DDS tape standard. Use of non-DDS media may appear to
give satisfactory results, but the inferior specifications of such media can cause data-
integrity problems.
Switch 3 is reserved on DAT72 drives. On DDS-4 drives, switch 3 enables or
disables the media-recognition system (MRS). If switch 3 is ON (the default setting),
the drive reads and writes to MRS media and reads from but does not write to non-
MRS media. If switch 3 is OFF, the drive reads or writes both MRS and non-MRS
media.
Switch 4 enables or disables execution of power-on self-test diagnostics when the
drive is powered on. If switch 4 is ON (the default setting), the drive responds to
SCSI commands only after successful completion of the self-test (about 5 seconds).
If switch 4 is OFF, the drive does not perform a power-on self-test.
Switches 5 through 8 configure the drive for use with UNIX and other non-Windows
operating systems. See the DAT 72 Configuration Guide or DDS-4 Installation
Manual for details. The default setting for all four of these switches is ON.
Switch 9 is reserved on DAT72 drives. On DDS-4 drives, switch 9 enables or
disables SCSI Wide operation on the SCSI bus. When switch 9 is ON (the default
setting), the drive is capable of operating in Wide (16-bit) SCSI mode. When switch 9
is OFF, the drive operates only as a Narrow (8-bit) SCSI device.
Note: If switch 9 is set to OFF, the drive can use SCSI ID values 0 through 7 only.
Switch 10 is used to select the Vendor ID that the drive returns when queried with a
SCSI Inquiry command. When switch 10 is ON (the default setting), the Vendor ID is
"SEAGATE DAT." When switch 10 is OFF the Vendor ID is "ARCHIVE Python." The
"ARCHIVE Python" Vendor ID may be used by independent software vendors to
provide software compatibility with previous Seagate DDS tape drives.
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