Made an fstab entry -> /dev/sdc /home/me/REPOSITORY ext3 defaults
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/dev/sdc is the disk itself, not the partition. It should probably be either
/dev/sdc1 or /dev/sdc5 (it will be 5 if it was an extended partition rather than
a primary one).
Running fdisk -l (with the disk plugged in :-) should tell you which partition is ext3
on it now.