Bert,
Thanks for your input. You are right that the thumbdrive is FAT32, and will not accept reformat to NTFS. I don't have the WD HD at home to check it.
I tried a 8 GB video file (non-compressed)that copyed fine, but the other point you made is that a compressed file may not be able to be split.
I'll let you know what happens.
Lon Hatfield
Family Practice
Colville, WA