You won't be able to use Unsafedisk on MOHAA or any other 2.51 game. For Black & White you can use it. If you don't want to use it you can download the fixed exe from
GCW
Instructions for Unsafedisk:
1)Copy all dll's to a temp directory, along with the main exe as well.
2)Run safedisk 2 dumper on the exe. A data.bin file is created.
3)Run safedisk 2 Rebuilder on the data.bin file. This creates your new 'fixed exe'.
4)Rename the new file to exactly what the original one was.
5)To burn to a CD-R - copy the whole disk to a temp directory, replace the original exe with the new 'fixed exe'. Use Nero preferably to burn the contents of the temp directory WITH THE ORIGINAL CD LABEL. If the label on the original cd is "B&W", then your copy must have this exactly as well.
BTW: Instead of replacing to exe from the start, you could just create a directory on the cd called crack. Then when you install it, you copy the crack onto your hard drive overwritting the original exe. The advantage of this is you will have a copy of the original exe for updating. Alternatively you could create a directory called originalexe instead, and do it the other way which is handier.