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Installation

Media-Recognition System (Switch 3)

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.

Power-on Self-Test Enable/Disable (Switch 4)

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.

Operating System Configuration (Switches 5 through 8)

Switches 5 through 8 configure the drive for use with UNIX and other non-Windows

operating systems. See the

DAT 72 Configuration Guide

DDS-4 Installation

Manual

for details. The default setting for all four of these switches is ON.

SCSI Wide/Narrow (Switch 9)

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.

Inquiry String Switch (Switch 10)

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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Certance DAT 72 Manuale Pagina 27