I'm using a Western Digital My Book Essential Edition (500GB) external (USB 2) drive with my iMac. Previously, it was a little slow, but everything worked.
Now, I find that I cannot copy files from the WD drive to the Mac hard drive.
I get that circle-with-a-line-through-it symbol. Have never seen that before.
Neither will it allow me to copy files to a USB thumb drive (which also works with a PC).
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