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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