Unable to delete from the camera itself

Have you just tried formatting it on the camera? - if so get it in a card reader on a computer and try to format from there - sorry not used mac OS recently, but if i remember rightly it is simple enough to do.

If that doesn't work, just try it on a different computer - there may just be some sort of software clash that stops you deleting the files.

If you still have no luck, try running a disk diagnostics utility on the card - if you don't have one let me know with your OS version and I can hunt one down for you - Most versions of windows have a basic one built in, not sure with macs.

If still no luck, before throwing it away, just place it somewhere dry in your fridge overnight and try again cold - if that doesn't work try freezing it - let it warm up to fridge temperature before using it.

This will almost certainly not work, and the science of these cards would indicate that it shouldn't, but if you are going to throw it anyway, give this a try - I have heard stories of it working, but never had any success myself. (Please let me know if it works)

some manufacturers have quite reasonable warranty on these cards, if you are unsure and you think it might, post back with the make and model etc of the card, just might get lucky.

:) Have you just tried formatting it on the camera? - if so get it in a card reader on a computer and try to format from there - sorry not used mac OS recently, but if i remember rightly it is simple enough to do. If that doesn't work, just try it on a different computer - there may just be some sort of software clash that stops you deleting the files. If you still have no luck, try running a disk diagnostics utility on the card - if you don't have one let me know with your OS version and I can hunt one down for you - Most versions of windows have a basic one built in, not sure with macs. If still no luck, before throwing it away, just place it somewhere dry in your fridge overnight and try again cold - if that doesn't work try freezing it - let it warm up to fridge temperature before using it. This will almost certainly not work, and the science of these cards would indicate that it shouldn't, but if you are going to throw it anyway, give this a try - I have heard stories of it working, but never had any success myself. (Please let me know if it works) some manufacturers have quite reasonable warranty on these cards, if you are unsure and you think it might, post back with the make and model etc of the card, just might get lucky. :)