I was VERY young when I had that system but I do remember it having its own controller (I attempted to fit it to a AMD 386 with no luck)and the port was labelled "Winchester" hence why I called it a Winchester, it was 10Mb in size, and the drives connector looked a bit like the C64s motherboard datasette connection, I also recall having to put in ALL the drives info into the BIOS everytime we wanted to use the dam thing because the CMOS battery was flat and was some kind of strange none-standard pos too!
I remember it being huge and we took the platters outta it and used them as frisbees some time in the 486 era