I've already "been there and done that".
I had a file system on a partition fail CHKDSK, and I immediately
copied all the data off, tested and cleaned up the disk, then
copied the data back.
You should not allow latent (sleeping) faults to accumulate. Say
you have "one tiny problem" today with the file system. Tomorrow,
another tiny thing happens, but combined with the first problem,
a whole directory goes missing. You'd be pissed. If you see
known faults developing in a system, don't let them fester.
Fix it, as time allows. Now, moving 1TB of data, over a 30MB/sec
USB2 interface, is going to be slow, so it could take a while
to clean up.
To copy the whole partition, you could use Robocopy, as it keeps a log
of what was done, what failed and so on. I use that for doing whole
partitions. Robocopy will do a number of retries, as specified by
the command line parameters. This is a form of synchronizing utility,
but I usually copy to an empty partition, so there are no files
already on the target disk.
robocopy Y:\ F:\ /mir /copy:datso /dcopy:t /r:3 /w:2 /zb /np /tee /v /log:y_to_f.log
(Command line version XP026 of robocopy, should be included in this...)
http://technet.microsoft.com/en-us/magazine/2006.11.utilityspotlight.aspx
Also, always read the reviews on Newegg, for any of these
pre-built drive and enclosure solutions, to see what their
failure rate and characteristics are like. Certain products
in the past, "dropped like flies", in some cases losing
all user files in a matter of two days after purchase. In
other words, a user transfers all their backups to the new
drive, erases the old, only to find two days later, the new
drive is dead and all the files are gone. Always review what
is known about a unit, to decide what your handling policy
should be.
Say, for example, you buy two 1TB units, and they're the
"drop like flies" kind. You would duplicate files on the
two units. That way, you have some opportunity to save
the files, if one unit fails. If you operate the new purchase,
as a 2TB storage facility, and one drive drops dead in two
days, you've lost 1TB worth of files. If a product doesn't
give the appearance of reliability, you can use redundancy
to help ease the situation if there is a failure.
Paul