You have to use the 64bit version of xDelta otherwise you may get an out of memory error. If the ISO is smaller, say 200 MB, then it will only use a maximum of 200 MB of memory and not 1.8 GB. This uses a 1.8 GB buffer maximum, enough to read ahead an entire dual layer UMD into memory. ISO example, to create the pach, type: xdelta.exe -9 -S djw -B 1812725760 -e -vfs “old.iso” “new.iso” “SERIAL_Old-CRC_to_New-CRC.xdelta3″ This works great for making transfer patches as sometimes the files in the archives are in different positions. It will take a few minutes for the patching creation to start as xDelta has to read the entire file into memory. You can get around this by changing the buffer size with the -B option (this increases memory usage when making the patch!). XDelta only really works well at the default settings if the data hasn’t moved around much in the file: by default it will look ahead and behind 8 MB to find a match, if not it will add the data to the patch. To create “patch.xdelta3″ that generates “good.aaa” from original “bad.aaa”, just type: xdelta30u.exe -e -s bad.aaa good.aaa patch.xdelta3 To apply “patch.xdelta3″ on the file “bad.aaa”, generating “good.aaa” just type: xdelta30u.exe -d -s bad.aaa patch.xdelta3 good.aaa Included is a 32-Bit & 64-Bit version as well as the source code. Open-source binary diff, differential compression tools, VCDIFF (RFC 3284) delta compression.

How to patch with xdelta ui