Thanks, maybe it was either the xdelta dll or lz4 library.
I will investigate further.
PS: What -t and -c settings you used for xtool?
Edit: Same error happens randomly
Code:
Compressing 62 files, 47,322,268,354 bytes. Processed 30.6%
ERROR: write error (disk full?) in compression algorithm xtool:msr22
liblz4 1.9.2
no xdelta dll
-t100p -c32mb
no --dbase parameter