Editing Personal Jukebox (section)

===File system and table of contents (TOC)===
The PJB's disk is not formatted as [[File Allocation Table|FAT]] or [[File Allocation Table|FAT32]] as is the case with most of the players that were released later, and enables those to be mounted as another drive in an operating system. Instead, a '''unique file system''' is used, which, while losing the mounting ability, is optimized for the structure of MP3 files (having a cluster size of 128&nbsp;kB, which equals about 8 seconds of 128-kBit-encoded MP3-music). Therefore, managing actions like defragging become unnecessary. The file system allows the linking of Tracks into various Discs/Sets. Therefore, each track is ideally only stored once on the disc and recurring occurrences of it (for example in playlists or samplers) are just links to the original file. This may help to preserve a good amount of disk space and allows for more tracks to be stored on the disk.

All of this info is stored in the TOC (table of contents). The TOC is stored in a human-readable text-format and can be downloaded, changed with a text editor and re-uploaded to the PJB again. A copy of the TOC is always stored on the unit as well, so errors and damage to the original TOC can usually be fixed.