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Heatshrink compressed drives? - Tamp ISO compression test (Announce)

posted by tom Homepage, Germany (West), 31.01.2025, 17:42
(edited by tom on 31.01.2025, 18:29)

> > A simple scheme would be to only store the absolute offset of every 16th
> > compressed sector, followed by only the 16 lower bits for the next 15
> > offsets.
>
> A less simple scheme that saves even more would be to store only the
> length, allowing packing two sectors into three bytes (a la FAT12); doing
> that for 32 sectors would be 52 bytes (dword address plus 48 bytes for the
> 32 lengths). Not sure how practical it would end up being, though.

Given that the compression unit of 2K will be compressed to (on average) ~1.5K,
it's fairly irrelevant if the offset is stored in 2, 4, or 3 bytes.

Also: in the published results for TAMP, does TAMP always start fresh for the 2K unit, or does it keep the previous compression engine state?
For the discussed purpose, the compressor would need a reset for each 2K unit.
I read the TAMP instructions, but it wasn't clear to me.

 

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