Why won't my iMac recognize my micro sd card through my card reader?

I restarted my computer twice and it still doesnt work... This has never happened to me before.

Do you have your Finder Preferences set to show external disks on the desktop? And is your reader USB? Readers to fail - they are just hardware and can (and will) fail at some point. Do you have another card reader and/or have you tried it on all your USB ports (to rule out a port problem)?

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