11-36 Chapter 11
SCSI Peripherals and I/O Information
Figure 11-13 A3183A Switch Settings
Table 11-18 Configuration Switches (For Data Compression DD-2 Tape Drives)
Table 11-19 Configuration Switch 3 (For Media Recognition System)
Switches 4 through 8 are used to specify drive connectivity and functionality according to host or
customer requirements (not used on this system).
Default switch setting = Switch 3 Off, all others On.
Preventative Maintenance
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 Cleaning Needed 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, the host is allowed to control
compression
On Off Compression enabled, no host control
On On Compression enabled, with host control
Switch 3 Meaning
On Media Recognition System is disabled. All DDS tapes will be treated the same,
whether they posses the media recognition stripes or not.
Off Media Recognition System is enabled. Non-media recognition system tapes are
treated as if they are write protected (Default setting).
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