Hmmm. The way to do this with a full-featured Unix install would be:

cd /drive1/fids

find . -exec cp {} /drive0/fids/ \;

but I don't think that the empeg has a find command.

Oh -- if the drive you're copying to has no data in the fids directory (I've never seen a brand-new empeg drive), you could try

cd /drive0

rm -rf fids

cd /drive1

cp -R fids /drive0