It is working… may be not so good. When I wrote the post I started for the test. There was problem with NTFS format (or FAT32 I don’t remember), but after some updates it is OK. Months ago I started the server continuously with USB flash drive. But in not fixed period the USB storage unmounts alone ( see this: http://forum.mikrotik.com/t/mount-point-for-usb-storage-is-not-consistent/76897/1 )