Main board uses Marvell 88SE6121
Right - I can't actually (googling quickly) find a working driver for that chipset. The cheap easy solution to having an external sata port that works using the cold-boot method I mentioned above is to purchase an "sata to esata bracket" such as this one: http://www.newegg.co...N82E16812816068
That effectively connects the drives to an internal SATA port, which doesn't support hot plugging but works otherwise fine. I have one and it works well.