QUOTE(kenshiro @ May 19 2010, 03:00 AM)

False. The encrypted / decrypted sprites data of Neogeo games has exactly the same size. It is only a descrambling algo based on XOR tables.
While it's true that the sets are the same size whether encrypted or decrypted, we're talking about
compression potential here. The amount of space they take up when uncompressed is irrelevant to my comments, and certainly doesn't prove them wrong.
QUOTE(kenshiro @ May 19 2010, 03:00 AM)

It is not stupid. It is just a proper way to reference things, and keep accurate roms sets. Related to mslug3, the decrypted set will use all parent's roms (P-X, V-X, M1) and contains only the decrypted C-X roms, so no waste of space on the HDD.
C as well as P, in this particular case.
Think about it. If you're storing the complete parent set in addition to the child set, then right off the bat you've got two effectively identical copies of well over
half the game (those C ROMs are large and numerous).
If that isn't bad enough, one of these copies is taking about roughly double the drive space as the other (as encryption is not compression friendly), and takes longer to load if you try to play it.
This is why people often merge the required parent ROMs into the child set (eg using ROMCenter), then remove the parent set from their collection completely. There's no logical reason not to treat the decrypted versions as parent sets, and remove the encrypted versions altogether. OCD doesn't count as a logical reason, before you bring up the matter of perfectionists who want every ROM ever in the "original format" stored on their drive. All decrypted ROMs lose is encryption.
It's like someone found a file stored in ACE format with minimal compression, then decided that instead or repacking it in a ZIP/RAR, they'd distribute it in both ACE
and ZIP format. Together. It's pointless idiocy.