Running compressed files in 0.9.8
#11
7z compression shows no benefits over ntfs compression, empty space is always compressed, and dummy data usually uses uncompressible patterns.
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#12
(06-07-2011, 01:03 AM)Squall Leonhart Wrote: 7z compression shows no benefits over ntfs compression, empty space is always compressed, and dummy data usually uses uncompressible patterns.

I think 7z usually compresses much better than NTFS (I'd guess at least 20% better on average). However, NTFS is also aiming for random access, which is quite hard with 7z (where decompression is completely sequential IIRC). I'm not sure if "indexing" a 7z archive is practical.

The Linuz Iso CDVD plugin compression is based on bzip, but it doesn't create a standard bz archive. IIRC it uses custom indexing to allow random access. It's also better than NTFS compression (and reliable in my experience), but not good enough for me because selecting a different compressed ISO file is less convenient than simply clicking one of the recently used ISOs.

Overall, IMHO NTFS compression is probably the best compromise with PCS2.

However, if HD space is really tight, the Linuz Iso plugin might be an option, or, as someone suggested, keep all ISOs as 7z archives, and have only one decompressed file at a time.

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#13
using SF Anthology, the ondisk size is 1.78GB, using ntfs compression (actual size is 4.38GB) and 7z is 1.46, (could be lower with lzma2 i expect) which is around 17.5% difference this doesn't reflect other titles however as this is basically a collection of psx titles with mostly white space.

the difference in FFX or XenoSaga is less than 2%. not enough to really worry about.
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