So I did your tutorial and all seemed to work ok up until step 7. I booted the system from a USB stick but I want to install the DSM also on a USB HDD. Is that even possible?
On step 7 when it tries to format the system partition, it fails every time, whether I install the .pat from a browser or from the Synology Assistant.
I don't have any internal HDDs. My setup is a x86 Wyse thin client V10L with 1Gb Ram and an external USB Hdd with 250 Gb.
Link to the thin client: http://parkytowers.me.uk/thin/wyse/vx0/WyseV90L.shtml