I'm trying to install ROCKbox on my 4G iPod Nano 1st Gen. I'm currently trying to convert it to FAT32 but I don't have access to a Windows computer, and when I run the "dd if=mbr-nano4gb.bin of=/dev/disk2" command after navigating to the correct directory I get a message saying "dd: /dev/disk2: Permission denied". I unmounted the iPod using disk utility so that isn't the problem. Could someone shed some knowledge on me regarding the situation?