Why does my hard drive keep dismounting...help please I am going bonkers...

Brand new AEBS ver7 firmware
Works fine on the network and to the gateway for the internet.
Plug in a Lacie320 drive tot he USB, it sees it, it appears to work (but slow) for a while. Leave it to backup and when I return the disk has dismounted? Gone
Cant look at logs as I cannot reconnect without rebooting the router at which time the logs all are deleted.
If I try to reconnect it gives me an error connecting to Airport.
Only way out is to reboot AEBS.
If I try to delete files from the hard drive when connected it hangs, computer has timer going round forever message box is open but is not scanning files to delete, it is as if it can't see the drive and is searching...plus it has a small message box I cannot read (half off the screen), only way out of this is a physical reboot (hold power button down for 4 secs)
Now I have the drive on the USB direct to the machine, works great. So is this a firmware issue on the Airport unit?
Help please, I have spent days messing around with this and am about to give it up.
MacBookPro DualCore Mac OS X (10.4.8)
MacBookPro DualCore Mac OS X (10.4.8)

If you look in the iTunes folder on your original hard drive you should find a lot of files named "Temp File". These need to be deleted. I have not figured out what causes these or how to stop them from being made. If anyone knows the answer it would be greatly appreciated. When I delete mine it takes a very long time for them to delete, not the 2 minutes that countdown clock claims!
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Why does my hard drive keep dismounting...help please I am going bonkers...

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