I've got a CuBox i4P with an external SSD connected via eSata and has an external power supply. The 960GB SSD isn't recognised on the system:
df -aTh
Filesystem Type Size Used Avail Use% Mounted on
sysfs sysfs 0 0 0 - /sys
proc proc 0 0 0 - /proc
udev devtmpfs 869M 0 869M 0% /dev
devpts devpts 0 0 0 - /dev/pts
tmpfs tmpfs 202M 8.1M 194M 5% /run
/dev/mmcblk1p1 ext4 15G 1.2G 14G 8% /
securityfs securityfs 0 0 0 - /sy