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USB connections downgrade from USB 2.0 to USB 1.1

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http://forums.fedoraforum.org – I have the following USB 2.0 devices connected to USB 2.0 ports: - external hard disk drive - thumb drive I have noticed (particularly with the external hard disk drive, because it is always attached) that the connection becomes noticeably slow at some point. I have come to know that detaching and reattaching the device returns the speed to normal. Within the past few days, I noticed while using Disk Utility that the "Connection" for these devices, which normally shows as "USB at 480.0 MB/s," shows as "USB at 12.0 MB/s" during the same times I am observi (HowTos)