DAT audio tapes contain a subcode which, among other things, includes
an absolute-time counter. This allows you to know that, say, the data
you want starts at time 1:07:04.14, and have it be consistent across
decks. The absolute time can be read (if you have clean heads) even
during fast-forward and rewind which occur at over 100x normal speed.
If you insert a unrewound tape into a deck, it will immediately read
the subcode to find out its position. It is a shame that DAT data
drives don't have a feature like this.
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