13-May-2016, 16:29
Altus I would definitely try the SD Card Formatter mentioned above. If you go to their site there is some information on how using an OS to format the SD card may cause problems. It's a free program so there's nothing to loose. I use it regularly with an El Capitan Mac Mini and have had no problems with this computer or for a Raspberry Pi that I use as well.
iMac 2021, Roon, home wifi, Devialet Phantom I x 2