Silicon Graphics IRIS Indigo Owner's Manual page 90

Chapter 4: Installing Peripherals
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If the LED on the front of the DAT drive still flashes after you have cleaned the
Note:
drive heads, you may have a worn out DAT tape. Try using a new DAT.
Follow these steps to clean your DAT drive:
1. Insert a cleaning DAT tape.
Use a cleaning DAT tape authorized by the DAT drive manufacturer.
The drive loads the tape and starts cleaning the heads.
Be sure to use a data cleaning tape only. An audio cleaning tape does not work.
Note:
2. After about 10 seconds, the drive ejects the tape.