If it is a older model with a FAT32 File System, then it is possible Microsoft Windows 7 will ask you to re-format the device to NTFS in order to recondition it for a Microsoft Windows 7 environment. If you still have access to the old Microsoft Windows XP system, please proceed to copy the information back to it, format the device within the new Microsoft Windows 7 system (Which will enable backwards compatibility), and then copy the files back into the unit.
If this is not possible then you may need a partition recovery software.
