You may sometimes see a message – Windows found errors on this drive that need to be repaired. If you see it, you may want to run a scan manually. Earlier, you had ...
TL;DR - every external HDD gets "the volume /dev/rdisk[X]s1 [with UUID etc] was found to be corrupt and needs to be repaired" (it doesn't repair it). Even though those disks were fully erased and ...