Not sure where to put this but figured here is best. I've a 64gb MicroSD that i photographed a wedding on to 2 months ago, worked fine. I've gone to format it in my Nikon D810 on Thursday and it failed, states it's locked. I've tried it in a new adapter that i'd just used to format another and it failed again. Popped it into the PC and it doesn't show in explorer, but does in diskmanager, but I can't do anything with it as all the options are greyed out. I've installed SDFormatterv4 as suggested online, if I run the software with the SD already in the laptop it doesn't actually load. If I remove the Sd it'll load, but as soon as the card is put in the laptop the software dies. If the SD is in the camera I can see all the photos indicating I can still read from it ok, none of the photos are locked. Any suggestions on how to proceed?