SDCARD reader Read-Only

I have a 2012 Macbook Pro 13inch 2.5 GHz, 4GB Ram, 500GB HDD. Upgraded to Yosemite 10.10 and was looking to put Magic Lantern on a Canon camera, so I put the SDHC card in the card reader only to find that it sees the card as read-only. The lock button is in the off position (meaning it should be able to read and write to the card).
Have reset both the SMC and PRAM to no avail.
Just curious if I missed something with the 10.10 update. I have tried two different cards: One is an SDHC and the other not. Any help or guidance would be appreciated.

Never reformat a camera's memory card using your Mac — always reformat the card or delete pictures from it using your camera's menu commands, not the Mac. A card that's been formatted on a Mac or had pictures added to or deleted from it by a Mac is likely to be found unusable by many cameras. Reformatting in the camera usually resolves that problem.
As for your card being seen as read-only by the Mac, that's not a drawback if you adhere to the practices I've recommended above. But if you want to use an SD card for something other than uploading photos from your camera to your Mac, then it's a pain, and the problem ha been reported here a number of times before. For some people, inserting the card very fast into the SD slot has remedied the problem. Others have found that they need to push the card slightly upward, downward or to one side or the other while inserting it, rather than just pushing it straight in. Still others have found that certain cards' locking sliders bind against the side of the slot and get pushed into the locked (read-only) position as the card is inserted. You can experiment with all these ideas and see what happens, but in some cases just switching to a different brand of card has been the answer. And while it's irksome to contemplate resorting to a USB card reader when you have what ought to be a perfectly good SD reader built into your computer, for some people that has been preferable to relying on an unreliable SD slot.

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