WD Passport 1TB USB 3 - Very slow for USB 3... even after Format!

WD External Drives WD Portable Drives
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So, are you suggesting me to better try to return the drive and get a new one instead of trying to fix it?

If yes, then can I return it directly to WD through an RMA process, or should I return it to the store that I have bought it and ask them for a replacement?

Thank you.