I had put my computer on standby (running XP) for sometime with my hard disk plugged in and utorrent running. When I turned it back on the hard disk started making weird noises and then the computer stopped detecting it.... I had this hard disk for LESS THAN A MONTH and have valuable data on it.
I have the purchase bills but I'd rather have my data back than exchange it for a new hard disk.
Plug it in to another computer and/or another USB port, see if you can access the data.
If the physical drive is making noise you might be SOL. I have two out of 3 GoFlex drives that went out in less than a year. I have even removed them from their cases and installed directly via SATA, no dice.