Moto, just an important tip:
Never copy files directly from Amiga partitions to a peecee. You will loose the uni* special flags (Amiga use all of them).
A good approach to solve the problem is create the lha archive in the RAMdisk and then throw it thru the network (via FTP or any solution you like).
Keep the archive sizes under 100Mb each (to avoid lack of memory) and problem solved.