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All external USB 2.0 hard disks just 12 MB/sec throughput

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Now that my malware and Windows woes pretty much have been put to rest here at two other forums, I have but one question left:

What could be the culprit that limits the throughput on my four external hard disks, all connected through one and the same Dynex powered 7-port USB 2.0 hub, to a rather paltry 12 MB/sec, as reported both by PC PitStop and by HD Tune? I never paid much attention to it before, so I can't even tell if it used to be higher or not. But when I had to perform a restore / system rebuild about a year or two ago, the transfer of approx. 100 GB over this connection took a whopping 18 hours, which seems more in line with the old HiSpeed USB specification rather than the theoretical throughput on a USB 2.0 connected device.

A recent PC PitStop report is available here.

Any thoughts?

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