Installing external tape drives Reviewing Drive Default Settings

35
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: If you change the drive’s default SCSI ID, avoid using SCSI IDs 0 and 1 (which
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.
FIGURE 11. Back Panel of the External Tape Drive
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.
Media Recognition System checking (DDS-4 drives only) Enabled page 36
Power-On Self-Test diagnostic Enabled page 36
Host operating system Microsoft Windows 98/Me/
XP/NT/2000/2003 Server
page 36
TABLE 5 . External Tape Drive Default Settings (Continued)
Parameter Default Setting See...