Hi, I've just purchased two different USB3.0 SATA enclosures from Amazon, and in both cases the drives in them will refuse to spin down when told to. For example, when I eject a USB2.0 or FW400 attached drive, it spins down. Or if I sleep my Macs, all attached external drives will spin down. But this doesn't happen with either of the USB3.0 enclosures. Is it to do with the fact that I'm using USB2.0 ports on each of the Macs I've tried? I've used the cable supplied by the manufacturer each time, and the same thing happens on two different Macs, one running Mavericks and the other Mountain Lion. I'm waiting for a USB3.0 PCIe card for my Mac Pro which is why I'm using the new enclosures, but my MBP will always be USB2.0 so if this spindown issue is related to USB2.0/USB3.0 incompatibilities, I'll not be chuffed. EDIT: Looks like I'm not the first to have this issue, but this guy got no responses.