Hi
Just FYI. To be able to use a USB Flash Drive (normal usb memory) with the Mini NVR you need to change a "removable bit" in the drives firmware.
When the NVR is booting it checks /sys/block/sdX/removable. If this is set to 1 (usb memory) it won't use the drive. If it is set to 0 (usb hdd) the drive is usable.
For Corsair drives I used http://flashboot.ru/files/file/418/ but it is different depending on the flash controller in your usb drive.