USB Drive Not Recognized

Check in order:

1. File system format — Head units support FAT32 or exFAT. NTFS not supported. Reformat drive if needed (exFAT preferred for files >4 GB).

2. File location — Some head units only browse root directory or first level of folders. Move files to simpler folder structure.

3. File type — Check supported formats in manual. Most support MP3, AAC, FLAC, WAV. Not all support OGG, OPUS, MQA.

4. Drive power draw — USB ports on head units have limited current (500 mA typically). Large drives or drives with physical platters may exceed this. Use a flash drive, not a portable hard drive.

5. Drive filesystem errors — Run chkdsk (Windows) or Disk Utility (Mac) to repair filesystem errors.

6. Drive failing — Try a different drive. USB drives fail silently.