When connecting one at a time all OK but when connecting 2 of these drives on the same laptop only one is recognized? No drive letter or name. Changed name on one drive but still the same. can use Silicon power drive with one passport and all works well. Win 8.1 1tb drives.
Hello righteousone, welcome to the WD Community. That sounds like a signature collision problem. Click on the following link for the steps to solve it.
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