Hi Diego, thanks for the reply.
I'm not sure that the thread you pointed me to has the solution though.
I can enable write-back caching without any problem (the turn off buffer flushing is ticked in the device manager) - it's just that the setting doesn't stick when I reboot.
Also I'm not sure where to find "Enable write caching on the disk" and "Enable advanced performance".
I do have a UPS too Image may be NSFW.
Clik here to view.