What are the specifications of USB device (flash memory or hard disk) that can be connected to the unit (such as maximum size)?

The specifications of the USB devices that can be connected to the unit are as follows:
-Corresponding file systems
FAT16, FAT32
(HFS+ can be played, but the tracks analyzed in rekordbox cannot be used. Features such as retention of MEMORY CUE, retention of WAVE, and USB REC are not available.)
-Space limit of HDD
As per the specifications of the file systems.
-Other
If the device is split into multiple partitions, only the first partition can be used.