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Can hijack (or something else, for that matter) write to it safely?

Sure, but if the player ever decides to use the scratch partition differently than it currently does, things are broken. I am pretty sure there are entirely unused sectors in between the playlists/bookmarks and the per-FID data, and if not, the sectors in the per-FID area are mostly empty, with only about 60 out of 512 bytes used.
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- Tony C
my empeg stuff