8-64 SCSI and I/O
Configuration Switches
Figure 8-33 shows the configuration switches located on the bottom of the C2478SZ in their default
positions.
Figure 8-33. C2478SZ Switch Diagram
Switches 1 and 2 are used to configure the data compression operation mode for C2478SZ. The following
list shows the available options.
Note that with switch 1 on, data written to the tape will be compressed without the knowledge of the host.
Switch 3 is used to configure the drive to respond to DDS media recognition system tapes.
Switches 4 through 8 are used to specify drive connectivity and functionality according to host or customer
requirements. The default setting is all switches on.
Preventative Maintenance
Cleaning
Regular cleaning of the tape heads is essential to maintain the reliable operation and performance of the tape
drive. This procedure in NO WAY damages or shortens the life of either the drive mechanism or the tape
heads. The recommended cleaning frequency is every 25 hours of tape pulling time. You are advised not to
wait for the Media wear/caution signal to appear on the front panel before implementing the cleaning
procedure. By the time the indicator is present, the performance of the drive may already have been
impacted.
Switch 1 Switch 2 Meaning
Off Off Compression disabled, no host control
Off On Compression disabled, host is allowed to control compression
On Off Compression enabled, no host control
On On Compression enabled, with host control
Switch 3 Meaning
On The media recognition system is disabled. This is the default. All DDS tapes will be
treated the same, whether they posses the media recognition stripes or not.
Off The media recognition system is active. Non-media recognition system tapes are
treated as if they are write protected.
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