Sylia's Data Unit

Hmm, it looks more like a video tape
than something you'd store data on...
What does 707/HIGH mean?
I've seen the word "HIGH" and the letters "HQ" (High Quality) on video tapes before.

And what's that weird symbol beside the 1?
And the mark beside the 3?
If this is copy number 2 then where is the original tape?
Do any of the markings really mean anything at all?

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