Why won't my macbook read my 128gb sd card?

I've put my micro sd in a usb reader and my mac book says 'disk inserted was not readable by this computer' and i have the options to initialize, ignore or reject.
I'm trying to put films i have downloaded onto it and it works fine in my partners laptop. any idea why?
also what is the slot on my macbook next to usb ports, is it for memory card?

Howdy JakesDad83,
So your MicroSD card works in another computer but you get it's not readable with your MacBook Pro.
Your MacBook Pro (13-inch Mid 2012) does have an SDXC Card slot.
MacBook Pro (13-inch, Mid 2012) - Technical Specifications
Connections and Expansion
MagSafe power port
Gigabit Ethernet port
FireWire 800 port (up to 800 Mbps)
Two USB 3 ports (up to 5 Gbps)
Thunderbolt port (up to 10 Gbps)
Headphone port
SDXC card slot
Kensington lock slot
8x SuperDrive
So if you have the correct adapter you could try it "directly" in your computer.  See
About the SD and SDXC card slot - Apple Support
It has sections for adapter information, mounting issues and formatting.
Take care,
Nubz

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