First Gremlin?

I've had my iMac for a few months now but last night something happened that I jsut couldnt understand and wonder if this is the first sign of potential hardware failure?

I have a 640GB Iomega USB drive and last night I was converting some films to MP4. I was able to write new files to the drive and I was able to rename them. However when I then tried to copy them to my PSP (by dragging and dropping) it wouldnt copy and the cursor just changed to a 'no entry' sign i.e. a circle with a diagonal line through it. Furthmore if I tried to put any files on that drive into the trash it just wouldnt delete them. So I could write to the drive, read from the drive but couldnt copy the data to another drive or delete it.

I tried verifying the drive and repairing permissions on it but both reports came up clean with nothing needing to be done. In the end the only way I could regain full access to the drive was by rebooting the iMac.

Any idea's what this means?

Your PSP is formatted NTFS. This means the Mac can read them, but not write to them. You have to reformat it in Disk Utility.

Nah not that. The PSP can only be formatted FAT32. I tried disconnecting and reconnecting the PSP but that didnt make a difference and like I said, I couldnt even delete files of the Iomega drive which has nothing to do with the PSP at all.

Ah yes. I should have read your post more carefully because you can't write to NTFS either. D'oh!