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Thread: took Macbook Pro 10 hours to copy a 3TB drive to another 3TB drive, is that normal?
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Old Feb 13, 2016, 7:40 am
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gfunkdave
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Join Date: Nov 2002
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Well, at full theoretical USB 3.0 speed of 5Gbps (625 MB/s) it should take a little over an hour. But I don't think any consumer laptop can pull full theoretical speeds.

Still, it seems you were going at about a tenth of that speed - which just so happens to be the USB 2.0 full speed. Maybe one of your devices was communicating at USB 2.0 speeds.
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