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Copying partitions and backups from one external HDD to another

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While trying to copy, I get errors such as an I/O problems with certain files that I'm trying to copy and paste.
I have to "skip" all but a few files. Any fix out there?

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Run chkdsk /r on each partition of the internal drive, and on the external HD. If there are hidden partitions, assign letters to them so you can chkdsk.
Also run a drive checking utility from the drive manufacturer, as those sometimes catch errors missed by chkdsk.

Don't connect via a hub, a port in a monitor, a USB extension cord, etc. Connect the external drive directly to a USB port on the rear of the computer case.