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I ran across this on a >1TB drive formatted by Windows 10. I stuck the drive in a Linux machine and backed up the boot sector/partition table with dd bs=512 count=1 if=/dev/sdb of=/root/BigDriveSector0.bin (Your options to dd might need to change.)
I then zeroed the boot sector (again with dd), popped the drive back into my Windows system and booted spinrite without complaints on the "empty" drive. After it was done, I restored the boot sector and all was well again. If you feel comfortable with dd, you might have similar results.