A few ideas, there; be sure to check the usefulness before getting shed of it since those cards may work in several brands, and depending on format, are not backward compatible very far. They can be used as a flash drive if you have or get the USB adapter for use as a card reader; then just use it for storage. It would appear on the desktop same as a hard disk drive, but with Fat-32 formatting (or other, above fat-16.)
There are three MacBook Pro early 2011 models, w/ display & build options;
in 13"-15" there's 1 - Secure Digital (SDXC) card slot. 17" 1 - ExpressCard/34.
Not certain of compatibilty between SDXC & SDHC in your product(s)
If you choose to try and reformat the card to some other type, it would not be read by a camera unless the camera can reformat the SD card. I've tried a few things with these and have the card reader, so I know it can work like a USB flash easily enough. But my old Panasonic Lumix DMC-FZ1 with long zoom liked early SD <2GB cards, so I had to buy cheaper low capacity cards from a walmart. The nicer higher capacity didn't work.
Camera cards may be helpful to have on hand and if the reader in your computer (?) sees it, that'd be a plus. Not sure if you could use it as a backup source for offline re-install of Mavericks or another OS X. Being small, it could be great for other content, if not lost or damaged.
Anyway, hopefully this helps.
That you were given the card
is probably a good thing... 🙂