JVC KW-Z1000W Instruction Manual page 102

Appendix
■ Limitation on structure of file and folder
Maximum number of folder layers
Maximum number of files (per folder)
Maximum number of folders (per folder)
Maximum number of folders (per device)
• You can enter a folder name and file name with 255 or fewer single-byte characters.
• Files in the folder whose folder name begins with a dot (.) cannot be played.
102
USB device
8
999
9999
Unlimited