Recovering data from an external HD

Hello,
Pls help. I was using a faulty USB cable and now my external drive data isn't recognised. It also fell over, but I dont think there is any physical damage to the HD. The computer recognises it correctly but does not assign a drive. I've gone into computer management - Disk Management and the HD is found but no drive letter has been alllocated and the system is described as RAW. When I assign a drive letter to it the computer states that it requires formating to be used. Are there any programs that can sort out the file system. I think it should be a NTFS system not FAT32 please caan someone confirm if this is correct.

Thanks in advance =)