Re: Bulk erase mini DV tapes?
A permanent magnet will erase tape, in fact 'The Philips Tape Recording Book' suggests using a permanent bar magnet to erase clicks, etc, on the tape, but I wouldn't worry about stray fields from speakers, etc.
As a (relevant) aside, the disk pack hubs in my DEC disk drives (RK05, RL01, RL02, RK07) and indeed the hubs of the 3.5" floppy disks used on micros, are held to the drive spindle by a permanent magent in the flange at the end of the spindle. I am sure the designers of said drives knew what they were doing.
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