SD CARD saying read only after I tried to delete files from the card
Are these cards NTFS formatted and have you only had this problem since updating to Mavericks?  Are you using the free NTFS-3G and/or MacFuse NTFS driver? If you answer yes to all, then that is the cause.  I'm having the same issue and may have to buy Paragon's NTFS driver.

Maybe try uninstalling and reinstalling NTFS-3G and MacFuse