BaPW

I have an USB Maxtor harddrive. It has been working fine but now it shows up under my computer but I cannot access it and when I go to Device Manager it is listed and says that it is working properly but still it will not access. Have tried to get it to access from inside Word and other applications but no and it will not allow me to save to it. Any help would be very much appreciated. Under My Computer it lists the drive but does list any facts about the drive such as how much space and is used and how much is left.
When I tried to open a location from the open dialog box it came back with
F:\ is not accessible
The request could not be preformed because of in I/O device error.

I looked under computer management and it reports the file structure as RAW. A couple of months ago I converted it from FAT to NTFS and that went fine.