If you know you can't get suitable replacements, it's an easy problem - copy the data to a new pool and retire the old one. In this case, since the part number

If you know you can't get suitable replacements, it's an easy problem - copy the data to a new pool and retire the old one. In this case, since the part number didn't change, there was no way to know. Sector size is a pretty fundamental property of a disk drive.