> i'm runnning winhttrack3.30 and notice that even though my
> harddrive (ntfs, 10/20gb left) was just defragmented 
before,
> after running a mirroring operation, the /hts-cache/.dat,
> .txt, .ndx had something like 100-1000 fragments.

This is unfortunately necessary, to avoid too many losses 
in case of crash/failure: the disk commit must be 
aggressive enough.
The new cache format, however, should improve this by 
compressing the data and flushing bigger chunks.