Two Sandisk cards that were delivered today don’t appear to work properly with Macs.
On initial insersion they only appear to have a memory capacity of 24GB.
On inserting them initially the mac says each one is faulty and needs to be reformatted. So I used my Nikon D800 to format them. On re-mounting them on my Mac it says they cannot be repaired on a Mac.
Are these cards not suitable for Macs? Why am I getting these error messages?