>>>Is there any need to leave it connected?
No not as such... but I've just done this superb job of de-cluttering the deesk area so you can't see any cables. Both the usb and power supply cables are behind a heavy desk that would need pulling out to get to switch off.
I'll investigate the usb types as ours is a few years old and perhaps due for replacement as it's spent so much time spinning??
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