http://support.wdc.com/product/install.asp?groupid=205&lang=en I have the 5000MT. Just got this thunderbolt to firewire adapter on the 9th at my apple store. Anyhow the problem is when I connect the adapter to the mac mini I have (i5 2.3ghz 8gb ram) it works. But as soon as I put the mini to sleep the hard drive also sleeps. But my usb devices don't sleep. At least the lights are still on. So why is my firewire sleeping. Lights are out too. So its definitely sleeping. Energy saver put hard disk to sleep when possible. Unchecking this makes no difference. So is this normal or am I missing something??