SMC, PRAM reset, etc. Formatted drives in several formats, exFAT, APFS, FAT32, Mac OS Extended. Tried different cables (even thunderbolt certified), different hard drive caddies, tried different ports, tried disconnecting everything except those drives, tried different hard drive brands, restarted several times, ran first aid, reinstalled the OS, etc Looked all over google about the error 100006 and some random errors trying to erase, partition or reformatting the drive. They get ejected at random, quite often as soon as I plug them they keep getting ejected so I can't even do anything on them at all. Plugged them into windows and voila! they work just fine! ADATA SX8200 PRO and Toshiba NVMe M2 drives. Tried several brands for hard drive caddies. Seems like this is a long time error on such a renowned brand, how come this hasn't been fixed? Lots of threads and no solutions! Some manage to get them working, others never do!