on a linux machine
lsblk
parted -a optimal /dev/sd? rm 1 x
mkfs.ext4 -m 0 /dev/sd?
on the Mikrotik router
/disk/print Flags: B - BLOCK-DEVICE; M - MOUNTED Columns: SLOT, MOUNT-POINT, MODEL, SERIAL, INTERFACE # SLOT MOUN MODEL SERIAL INTERFACE 0 BM usb1 usb1 Kingston DataTraveler Max 204479A6A95081A50275 USB 3.20 5000Mbps
to create a directory named persistent-volumes place a file there using:
/file add name="usb1/persistent-volumes/test" contents="starter file"