When I try to copy directories of files to an external drive the copy window
comes up with a overly large length of time remaining (180+ minutes) and
shows the files flying to the new drive and the external drive's light starts
to flash.  After awhile the external drive's light stops flashing but the
copy window is still flying files and the length remaining is still high but
stays put. Nothing changes for a period of time.

When I try to stop the process the computer locks up.  After a re boot I can
look at the external drive and all the files have been copied.
The drive that I am copying from is an array of 4-80 GB drives. The disk
test shows no problems.

After moving files off the array I formatted this drive, moved the files
back, and I'm still encountering the same problem.

Any Thoughts?