I'm trying to modify MP3 files and FLAC files with several applications that were OK for System 7 64 bit. I have copied file from the Seagate USB 2 tB drives to the system drive and modify them with the same application without any errors. I can copy the files back to the Seagate USB 2tb Drives and they run without a problem. The only problem I have with these drives is modifacation on the Seagate USB 2 tb drives in System 7 64 bit? It sure sounds to me that the Driver for System 7 has an issue with System 7 64bit and modifying files?