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Hi dellstudio 1234,
Welcome to SevenForums.
An I/O device error and CRC errors on an external HDD mostly point to a failing/failed hard drive.
Since you had indicated that you tried diskpart clean all, I presume that you are not keen to recover anything from your ext. HDD.
Try the following:
1. Change the cable to the HDD and check.
2. Try the HDD on another computer with the new cable. If the same problem persists then it is certain that your system has nothing to do with this error and points to a faulty HDD.
3. Run the manufacturer's diagnostic/repair utility. If it cannot repair, go for a warranty return ( if within warranty).
4. Not to leave it to any chance, download HDD-LLF-Low-Level-Format-Tool ( the Windows executable that requires no installation) and Run it as administrator on the external HDD. If it can detect your HDD, it will try to do the same job as diskpart-clean all. You will see a running dialog that will indicate if it encounters any errors. If it successfully reinitialises the external HDD - which may take quite sometime - you have to format it - but I am skeptical. It is just to satisfy yourself that you have done everything possible.
This article is worth reading. Good Luck.