How to Format an SD Card on a Mac

If you’re a Mac user with an SD card that’s running out of space, you may be wondering how to format it to free up some room.

updated: 6/29/2023

In this guide, we’ll walk you through the steps to format your SD card on your Mac computer, so you can start using it again without any hassle.

Whether you’re a photographer looking to clear space on your camera’s memory card or just someone who needs to transfer files from your computer to your mobile device, formatting your SD card on a Mac is a straightforward process that anyone can do.

Note: When you format an SD or microSD memory card using a Mac, you’re essentially wiping it clean and starting from scratch. All data stored on the card will be erased.

Make sure you’ve backed up any photos, videos, and other files you want to keep before formatting the memory card. Keep in mind that once you format an SD or microSD memory card, the process cannot be undone.

How to Format an SD Card on a Mac

We’ll look at a few ways to format an SD card on a Mac. The first method uses the Disk Utility application that comes pre-installed on all Macs. The second method is faster and uses the Terminal.

Insert The SD Card Into The Computer

You will first need to insert your SD card into your Mac. To do this, locate your Mac’s SD card slot. You can find this on the right side of the computer, next to where you would plug in an external hard drive.

Insert the SD card into this slot. It should fit in only one way, so if it doesn’t go in easily, try flipping it over and inserting again. If you’re using a MacBook Air, the SD card slot is located at the bottom of your computer.

Once you’ve inserted the SD card into your Mac, it will appear as a new drive in Finder. You can access this drive just like you would any other on your computer.

Format Using Disk Utility

Formatting an SD card using the Disk Utility on a Mac allows you to erase all data and create a new, empty SD card. This is useful if you want to move data from your computer to an SD card or if you need to replace the default storage on your Mac.

To format your CD card using Disk Utility, follow these steps:

  1. Insert the SD card into your computer. The drive should appear on your desktop. If it doesn’t, you can find it in the “Devices” section of Finder.
  2. Open System Preferences and select “Disk Utility.” You will see a list of drives on the left-hand side.
  3. Select your SD card from the list and choose “Erase” from the top menu. A warning will pop up, asking if you are sure you want to erase the drive.
  4. Enter a name for your SD card in the space provided. You can choose any name you like, but it must be unique.
  5. Choose the format you want to use for your SD card from the list of options: Mac OS Extended (Journaled), ExFat, or MS-DOS (FAT).
  6. Click “Erase” to format your SD card. You will see a progress bar on the bottom of the screen as Disk Utility works its magic.

Formatting will erase any data currently stored on your SD card so be sure you have everything you need to save first. Once formatting is complete, make sure to eject (click On Eject) your SD card from your computer before using it with an electronic device or transferring files back and forth between computers.

Format With The Command Line

Formatting an SD card on a Mac using the command line is a quick and easy way to remove any existing files and create a new, empty SD card.

Be careful formatting your SD card with the command line as you could easily make an error and format the wrong drive.

To format an SD card using the command line:

  1. First open Terminal (found in Applications > Utilities).
  2. Next, type the following command and press enter: sudo diskutil list. If the disk you want to format isn’t listed, use the following command to list all disks on your system: sudo diskutil list -all.
  3. Finally, use the appropriate formatting commands for the disk you want to format. For example, to format an SD card with the ExFat format, you would use the following command: sudo diskutil eraseDisk ExFAT name_of_disk.
  4. You will be prompted to enter your password for sudo access and then the format process will begin.

Should You Format SD Card to FAT On Mac?

There is no right or wrong answer – it depends on what you’re trying to achieve. If you want maximum compatibility between Mac and Windows, format your SD card as FAT.

If you’re just trying to get your SD card working properly again, formatting it to FAT won’t do much harm. However, if you plan on using the SD card in a camera or some other device that requires a specific format, it’s best to reformat it.

The most common formats for SD cards are FAT32 and exFAT.

Formatting your SD card can cause problems if you don’t use the correct format – so be sure to check the documentation that came with your device before doing anything.

How to Verify the SD Card Is Formatted

To verify the SD card is formatted, you need to use your Mac or a computer with an SD card reader.

On your Mac, open the “Disk Utility” app.

Select the SD card from the list on the left side of Disk Utility.

Look for the volume name in the lower right corner – this is what you’ll see when you insert the SD card into another computer.

To verify the file system, click on “Info” in Disk Utility.

You’ll see a list of information about your disk.

On a PC computer, open File Explorer and browse to the drive where your SD card is located.

Select it and click Properties in the menu bar.

Click on the Details tab and under General, make sure that Format was set to FAT32 (or whatever your SD card’s file system is).

If everything looks correct, you can eject the SD card from your computer and insert it into your camera.

How to Eject the SD Card

How to eject the SD card on a Mac:

To eject the SD card on a Mac, open Finder and go to the drive where your SD card is located. Next, click on the eject icon in the upper right corner of your screen.

You can also use the key combination of Command + E to eject the SD card.

What are the different ways to format an SD card on a Mac?

There are a few different ways to format an SD card on a Mac.

You can use the Disk Utility app or the Terminal.

Each of these methods has its own pros and cons.

The Disk Utility app is the easiest to use and is less likely to cause problems. However, it can take longer to format an SD card using Disk Utility.

The Terminal is a faster way to format an SD card, but it’s more difficult to use and you could make a mistake that would result in data loss.

Which method you choose is up to you – just be sure to format the SD card correctly to avoid any problems.

What are the benefits of formatting an SD card on a Mac?

  • The main benefit of formatting an SD card on a Mac is that it’s easy to do and it’s less likely to cause problems.
  • Another benefit is that you can format the SD card to any file system you want, including FAT32 and exFAT.
  • Formatting an SD card on a Mac will improve its performance and make it easier to use.
  • Formatting an SD card will erase all of the data on it, making it ready for new storage.

What to do if the sd card is corrupt and can’t work?

If you are having issues with your SD card and it is corrupt or unreadable, you may need to run Disk Utility First Aid.

To do this, open the Disk Utility app and select your SD card from the list. Then click on First Aid and follow the instructions.

Next, check the security level of the SD card. If it’s set to anything other than “None,” change it to “None” and format the SD card.

If the SD card is still not working, you may need to format it using the Terminal. To do this, open the Terminal and type in the following command:

sudo diskutil eraseDisk FAT32 MBRFormat /dev/diskX

Be sure to replace “diskX” with the actual disk number of your SD card.

You can find this by running the “diskutil list” command in the Terminal.

Hit Enter and type in your password when prompted. Then hit Enter again to format the SD card.

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J.S. is the owner, content creator, and editor at I’ve worked in the IT and Computer Support field for over 20 years. The server hardware in my computer labs has mostly been IBM, but I’ve supported Dell, HP, and various other hardware. In addition, as part of my lab administrator responsibilities, I’ve learned, supported, and repaired/upgraded network hardware such as Cisco routers and switches. READ FULL BIO >>

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