Bad news I'm afraid.

DDS tapes contain a header that is read by the drive firmware to
identify tape type and also maintains a usage log, amongst other things.
If the tape is bulk-erased (using a big magnet) as opposed to being
erased in a DDS drive, this header is erased and the drive no longer
recognises the tape as a valid DDS tape and ejects it.

There is a similar issue with bulk erasing DLT, 9840, 9940 and similar
tapes. These tapes carry a clocking signal on the edge of the tape that
is written by the tape manufacturer. If these tapes are bulk erased they
will fail to work again as the drive requires the clocking signal to
sync the head to the tape and identify where on the tape it is.

Your DDS tapes will still work in a DAT audio drive, as DAT audio
devices don't use or require the header.

If you plug a DDS-4 tape into a DDS-3 or earlier drive, or a DDS-3 tape
into a DDS-2 drive, the drive will also eject the tape as it will not
recognise the header from the more recent format tape.

On Mon, 2006-07-24 at 17:18 -0400, Dan Langille wrote:
> I bulk erased some tapes.  Now the DAT drive won't settle with the 
> tape, and it ejects it. Any suggestions for getting these tapes 
> working again?
> 


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