Article: If you find a thin, rectangular slot into which your memory card will fit on your computer, you can insert the memory card without an adapter. If you do find a memory card slot on your computer, skip the next step. Chances are high that your computer doesn't have a memory card slot, so you'll need to use a USB memory card adapter. If your Mac doesn't have USB 3.0 ports, you'll need to buy a USB 3.0 to USB-C adapter into which you can plug your SD card adapter as well. Memory card adapters can usually support both standard SD cards and microSD cards, though you may need a separate one for larger, non-SD cards. Plug your memory card's adapter into one of your computer's USB ports. If a window on your computer opens when you do this, you can close it. If you're using a USB-C adapter, plug it into one of your Mac's USB-C ports first, then plug the memory card adapter into the USB 3.0 port on the other end of the USB-C adapter. If your computer has a memory card slot, make sure that the memory card's label is face-up (gold connector side-down), then push the memory card into your computer angled side first. Click the Spotlight icon, which resembles a magnifying glass, in the top-right corner of the screen. Type disk utility into Spotlight, then double-click Disk Utility in the resulting menu. Click the name of your memory card in the upper-left side of the Disk Utility window to do so. This tab is at the top of the Disk Utility window. A pop-up window will appear. It's in the middle of the window. Doing so prompts a drop-down menu. Click one of the formats in the drop-down box: MacOS Extended (Journaled) Formats your memory card for use with macOS only. You'll see other MacOS Extended options here (e.g., MacOS Extended (Journaled, Encrypted)). These options are also usable on a Mac. MS-DOS (FAT) Formats your memory card for FAT, which has a 4 GB file size limit but can run on most platforms. ExFAT Formats your memory card for use with most platforms. You may see additional options in the "Format" menu as well. It's a blue button at the bottom of the window. This allows your Mac to begin formatting your memory card. The formatting process can take anywhere from a few seconds to several hours depending on the card's size and your computer's speed.
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Check to see if your computer has a memory card slot. Plug your memory card into an adapter. Insert your memory card. Open Spotlight . Open Disk Utility. Select your memory card. Click Erase. Click the "Format" drop-down box. Select a format. Click Erase. Click Erase when prompted.