I have about 120 DLTape-VS1 tapes and 2 drives that are all near the end of their retention period, and have been superseded by newer technology. I would like to donate the whole package to my local FreeGeek organization in the hopes that someone else can get some more use out of it (many of the tapes have only been written once or twice). But first, I need a way to erase all of the tapes so that my company's data isn't leaked.
Build some sort of machine with both drives and manually blank each tape? How?
Use some sort of fancy magnet thing to passively wipe the data away?
Any other creative ways to reuse/recycle this investment in an ecologically friendly way?