The medium formats supported by the radio are ISO 9660 Level 1 and Level 2 and includes the Joliet extension.

When reading discs recorded using formats other than ISO 9660 Level 1 and Level 2, the radio may fail to read files properly and may be unable to play the file normally.

UDF and Apple HFS formats are not supported.

The radio uses the following limits for file systems:
• Maximum number of folder levels: 8
• Maximum number of files: 255
• Maximum number of folders. (The radio display of file names and folder names is limited. For large numbers of files and/or folders, the radio may be unable to display the file name and folder name, and will assign a number instead. With a maximum number of files, exceeding 20 folders will result in this display. With 200 files, exceeding 50 folders will result in this display.)
• Maximum number of characters in file/folder names:
• Level 1: 12 (including a separator . and a threecharacter extension)
• Level 2: 31 (including a separator . and a threecharacter extension)

Multisession disc formats are supported by the radio.

Multisession discs may contain combinations of normal CD audio tracks and computer files (including MP3 files).

Discs created with an option such as keep disc open after writing are most likely multisession discs. The use of multisession for CD audio or MP3 playback may result in longer disc loading times.