Sorry to bump an old thread, I just wanted to get the facts on this feature since there's no wiki 
Dolphin's compression does... scrubbing and compressing or just compressing? Is the compression lossless (will I get the same CRC32 or MD5 after I decompress it)?
I just tried compressing F-Zero GX and I got the exact same file after compress-decompress.
I want to know how this works in case it proves to be better than scrubbing my images and potential damaging them.
Dolphin's compression does... scrubbing and compressing or just compressing? Is the compression lossless (will I get the same CRC32 or MD5 after I decompress it)?
I just tried compressing F-Zero GX and I got the exact same file after compress-decompress.
I want to know how this works in case it proves to be better than scrubbing my images and potential damaging them.