We want to erase about 140 DLT tapes.  Some posts on the internet indicated that

degaussing them renders them useless while some followup posts indicated that

they can be reused.  I believe the latter is true.

Unfortunately, all three Dell PowerVault 120T drives that we own failed before I

could get our tapes erased.  I don't think I can convince myself to send them to

Sprague Magnetics (http://www.sprague-magnetics.com/dlttcert.htm) for erasing.

Does anyone have tape erasing equipment powerful enough for DLT tapes?  

Cyclotron Lab?  Computer Center?  I called the MSU Surplus Store and they don't

offer a service to erase tapes.  They can destroy them, but do not erase them.  

According to a Quantum product document I found

(http://downloads.quantum.com/dlt4000/dlt4000productmanual.pdf) the equipment

needs to have a magnetic field strength of 2000 Oersted to be sufficient to

erase DLT.

-Stefan