Ok I must of scared everyone away, but I have an update that might make this 
more clear. 

I removed the aj029a drive from the MSL6000 to investigate using HP LTT tools 
in a windows environment. I went through all the tests no problem, and then 
thirty minutes later with only forty seconds left in the test, HP LTT tools 
hung "not responding" while the tape was rewinding. I waited for a while (ten 
minutes) for the program to resume but then I realized what was happening. The 
tape drive was doing the same thing in the windows environment it had been 
doing with Bacula in Linux. It just drops off the radar while rewinding, and 
disappears from the device manager! In linux it's the same then I must use a 
script to rescan the scsi bus. This is why tapes were getting stuck in the 
MSL600 tape library using Bacula. Do these drives get too hot while rewinding 
then shut off as a safety mechanism? Bad caps?

 (http://postimg.org/image/txb2zuizn/)

So why would a HP 1840 LTO4 drive work fine with reading and writing processes 
but then just die during a rewind each time??   Is it something I can doctor or 
should I chuck the unit and get a new one? Someone has just offered me a new 
#PD093G#804 unit for 400$ so I'm thinking of just taking that to avoid this 
mess.

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