I just brought my home ESXi box online today and ran in to an issue. I was setting up the storage and was able to create a datastore on a spinner WD Red drive that was 1 TB in size. Easy enough. I wasn't able to do the same for a 64 GB SSD on the same SATA controller. I got an error trying to clear the drive's partitions and when trying to create the datastore. I pulled the drive, cleared in using diskpart so it was empty and unformatted. I put it back in the ESXi box, and ran in to the same issue. As far as I can tell, the drive is fine. Are there issues with the size of the drive, by any chance?