Scsi Id; Parity Checking; Data Compression; Figure 11. Back Panel Of The External Tape Drive - Quantum Audio DAT72 Online Manual

Installing external tape drives
TABLE 5. External Tape Drive Default Settings (Continued)
Parameter
Media Recognition System checking (DDS-4 drives only)
Power-On Self-Test diagnostic
Host operating system

SCSI ID

Each SCSI device on the bus must have its own unique ID. Your external tape drive is shipped with a
default SCSI ID of 6. If another SCSI device in the SCSI chain is already using this ID, use the SCSI
ID Selector switch on the back of the drive to change the drive's SCSI ID (see Figure 11 on
page 35).
NOTES:
typically are assigned to a boot drive) and SCSI ID 7 (which typically is assigned to SCSI
controllers or host bus adapters).
If you change the default SCSI ID, turn the drive power off and back on.
Back Panel of the External Tape Drive
FIGURE 11.

Parity Checking

By default, parity checking is enabled on the external tape drive. If you disable parity checking, the
drive still generates a parity bit.

Data Compression

By default, data compression is enabled. With this setting, the external tape drive compresses all
data written to tape and decompresses all compressed data read from tape. The degree of compres-
sion varies due to the type of data being processed.
Data with a high degree of redundancy, such as structured database files or graphics files,
•
are compressed most efficiently, often at a ratio of 2:1 or more.
If you
change the drive's default SCSI ID, avoid using SCSI IDs 0 and 1 (which
Reviewing Drive Default Settings
Default Setting
Enabled
Enabled
Microsoft Windows 98/Me/
XP/NT/2000/2003 Server
See...
page 36
page 36
page 36
35