> If i have a dat file some roms with only crc32, some with md5 and some with
> sha1, does clrmame choose which to hash if you select all three? or does it
> always do all 3?
>
> Is the speed even worth considering contemplating a "smart hash"? ie. sha1 then
> md5 then crc32?
>
> EgotisticalElf
>


CRC32 is a must, SHA1/MD5 are optional parameters. You can enable or disable any used hashalgorithm in scanner->checksums. Of course a sha1/md5 check means you have to unzip packed files to memory to calculate the checksums. This is of course time-intensive.
Normally you don't have to enable sha1/md5 if you used the rebuilder or fixmissing to add new files. Both routines got a sha1/md5 check enabled, so only valid files can be added.



Roman Scherzer