Hi All. I have just bought a 1TB Canvio Stor.e to back up all of my data using the Time Machine. At £50 with a 3 year warranty, it makes sense to me. I have reformatted the drive and have backed up for the first time. However the issue is that every time the iMac goes to sleep, it freezes and won't reopen without a forced reboot using the button at the rear. the screen shows up a dark grey and won't budge. I have tried ejecting the drive in Finder after use, but that defeats the object and the iMac only finds it again after a small amount if activity to start the issue all over again. It is connected to one of the USB ports at the rear. I appreciate that my best option would be the wireless Time Capsule, however at 5 times the price, it seems an expensive and costly way of solving this little niggle. Thanks, John.