The front panel of MiniDAQ's Exabyte tape drive includes an amber LED; this flashes each time a 32,768-byte data block is written to the drive. If the system is hung, record the state of this LED (on, off, blinking, etc.); note whether or not taping was enabled.
The flash frequency varies from occasional (for zero-suppressed, cosmic-ray data) to nearly continuous (for raw pedestal data). In the latter case, the tape-remaining counter will be noticeably decreasing (it shows 4585 for a new 5-GB tape).
One is checking for two things:
Written: 09-JUL-1997 by Roy Bossingham
Roy Bossingham, LBNL