I'd go for the erase, depends on the DLT version perhaps(?) but for
LTO-X tapes, they say right on the package NOT to degauss as a measure
of erasure.

On 4/27/07, Keith W <keith at cydonia.net> wrote:
> I have a hundred or so DLT IV tapes that were in a different/unknown
> tape stacker. I need to get them cleaned up so that my Overland machine
> will properly see them. Will a simple erase (mt -f /dev/st0 erase) clean
> them up enough to be seen by the newer DLT tape machine or do I need to
> have them degaused?
>
> +-----------------------+
> +       Keith           +
> +-----------------------+
>
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