The filesystem of early iPods was an HFS+ system, but this was switched to FAT32 when Windows compatibility was added. iPods other than the iPod Shuffle can be reformatted with either filesystem; the Shuffle only uses FAT32.
This page demonstrates the filesystem and folders of an iPod. Note iPod touch is exempt due to it running iOS. See also auto-created directories.
|/Recordings||Voice memos are stored in this directory in the m4a format. Only supported iPod models have this directory.|
|/Notes||Notes are stored in this directory. Only supported iPod models have this directory.|
|/Calender||Self explanatory. Only supported iPod models have this directory.|
|/Contacts||Self explanatory again. Only supported iPod models have this directory.|
|/.VolumeIcon.icns||The drive icon for the iPod when it displays on a Macintosh.|
|/iPod_Control||Basically the true root of the iPod, is hidden.|
|/iPod_Control/Device||Device settings and trainer data (supported models only) are stored in here. This is where most random stuff is stored.|
|/iPod_Control/Device/_locked||Passcode is here|
|/iPod_Control/Games_RO/||Games are stored here.|