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Damaged or lost clusters or communication error between the 2 devices. Sounds like either your HD is going down or your computer is having an other problem reading from the device. Use Norton Disk Doctor to scan and attempt repairs on the drive (You have norton system works installed? i remember from another post.)
If that doesn't correct the fault you will have to try to recover the data using other emergency data recovery software.
Be quick about it though- the longer any data is left on the drive the greater the chance of corruption (The odd bad block or sector showing its ugly head is usually nothing to worry about- when multiple bad blocks or sectors appear then you have a bigger problem).
Disable "Write Cacheing" in the system properties- if a system restarts itself during a write process because of power loss or just because it is windows this can cause the data being written to be lost and can leave unreadable garbage on a drive.
Let me see if i can remember the dos prompt commands that chkdsk use for repairing ntfs volumes- if you are running windows xp that is (Seem to remember you are) Or are the drives formatted using FAT32?
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