Native redirection can be used to redirect Mass storage devices into RDP (RDP Client mode and VERDE VDI Client mode with RDP protocol) sessions only. 

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The FAT32 and NTFS file systems are supported on the USB mass storage devices. The RX300, RX-RDP or RX420(RDP) device mounts the USB mass storage device locally prior to redirection. What actually gets redirected is the local folder under which the USB mass storage device is mounted. The redirected mass storage devices appear in RDP sessions as folders in the ‘Drives’ share of the thin client device:

Generic USB redirection can be used to redirect Mass storage devices into UXP sessions only. This applies to vSpace Client mode on VERDE VDI Client mode with UXP protocol on RX-RDP and  RX420(RDP).

All file system types supported by Windows OS should be supported with Generic USB redirection of mass storage devices. The redirected USB mass storage devices appear in UXP session as ordinary disk drives with a drive letter assigned: