The primary function of the AXN/MXN is as a network music player and the USB port is intended for convenient connection of USB HDDs and SSDs. As such, we can not guarantee compatibility with all USB HDDs and SSDs.
The AXN/MXN will read large capacity hard drives connected to the USB Media input. Some larger capacity drives, however, may require their own power supply, as the player's USB port may not provide enough power for the drive to function.
The AXN/MXN will support USB hard drives which are formatted to FAT32 and NTFS.