49How to operate the MP3 playerMedia capable of playing MP3 includes CD-ROM and CD-R discs.Compared to CD-ROM media commonly used for music discs, CD-R discsare fragile in high temperature/high humidity environments and one sectionof the CD-R may become incapable of playback. Fingerprints or scratcheson the disc may prevent playback or cause skipping during playback.Sections of a CD-R may deteriorate if left inside a vehicle for long periods oftime. It is also recommended that CD-R discs be kept in a light-blockingcase because the discs are vulnerable to ultra-violet light.MediaFormat of discsThe format of discs to be used must be ISO9660 Level 1 or Level 2.Control items for this standard are as follows:• Maximum characters for folder names/file names: 15• Allowable characters for folder names/file names: A~Z, 0~9, _ (underscore)• Number of files possible on a single disc: 65535* 1• Number of folders possible on a single disc: 300* 2• Number of files possible in a single folder: 300* 1 : Files aside from MP3 files (other than ".mp3" file extension) are alsocounted as single files.* 2 : A root directory is counted as one folder.F2Root directory (F1)F158Folder 2Folder 158Folder 159F300 Folder 300001.mp3002.mp3001.mp3002.mp3003.mp3004.txt005.mp3F159[Configuration example for CD supporting MP3]Number of files possible on a single disc is65535.Files aside from MP3 files (Example: 004.txt)also count as single files.
