attempt to access beyond end of device sdb: rw=0, want=8380502, limit=2049 attempt to access beyond end of device sdb: rw=0, want=8380503, limit=2049 attempt to access beyond end of device sdb: rw=0, want=8380512, limit=2049 attempt to access beyond end of device sdb: rw=0, want=8380512, limit=2049 FAT: invalid media value (0x01) VFS: Can't find a valid FAT filesystem on dev sda.