How to Repartition an SD Card

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Partition your SD card on Windows, Mac, or Android

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Last Updated: April 25, 2025

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• Windows
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• Mac OS X
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• Android
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• Video
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• Q&A
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• Tips

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Partitioning your SD card will allow you to protect and isolate certain sensitive files, create backups of programs and operating systems, and can even help enhance the performance of your computer or device.

Partitioning an SD Card on Windows

1. Insert your SD card into a USB drive on your computer.
2. Click “Start” → “Control Panel” → “System and Security” → “Administrative Tools.”
3. Tap on “Computer Management.”
4. Look in the leftmost panel under “Storage” and click “Disk Management.”
5. Right-click your SD Card’s name, select “New Simple Volume,” and click “Next.”
6. Type in the size of your partition, click “Next,” then choose a drive letter and click “Next.”
7. Choose if you want to format your new partition, then click “Next.” Click “Finish.”

Steps

Method 1

Method 1 of 3:

Windows

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1. 
   1
   Insert your SD card or SD card adaptor into an available USB drive on your Windows computer.
2. 
   2
   Click on “Start” and select “Control Panel.” The Control Panel window will display on-screen.
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3. 
   3
   Click on “System and Security,” then select “Administrative Tools.”
4. 
   4
   Click on “Computer Management.” The application will launch and display on-screen.
5. 
   5
   Click on “Disk Management” in the left pane under Storage.
6. 
   6
   Right-click on the name of your SD card and select “New Simple Volume.”
7. 
   7
   Click on “Next” in the New Simple Volume Wizard that displays on-screen.
8. 
   8
   Type the desired size of your partition, then click “Next.”
9. 
   9
   Choose a drive letter to identify your partition, then click “Next.”
10. 
    10
    Indicate whether you want to format your new partition, then click “Next.”
11. 
    11
    Click on “Finish.” Your SD card will now be partitioned.
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Method 2

Method 2 of 3:

Mac OS X

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1. 
   1
   Insert your SD card or SD card adaptor into an available USB drive on your Mac computer.
2. 
   2
   Open the Applications folder, then click on “Utilities.”
3. 
   3
   Click on “Disk Utility.”
4. 
   4
   Click on the name of your SD card in the left sidebar of Disk Utility.
5. 
   5
   Click on “Partition” at the top of Disk Utility.
6. 
   6
   Click on the dropdown menu below “Volume Scheme,” and select the number of partitions you want on your SD card.
7. 
   7
   Click on each partition, and select a name, format, and size for each subsequent partition.

   • If you want to use your SD card as a startup disk, click on “Options,” and select “GUID Partition Table.”
8. 
   8
   Click on “Apply.” Your SD card will now be partitioned.
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Method 3

Method 3 of 3:

Android

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1. 
   1
   Verify that the SD card you want partitioned is installed inside your Android device.
2. 
   2
   Navigate to Google Play Store on your Android device.
3. 
   3
   Search for and download the ROM Manager application by ClockworkMod.
4. 
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   Launch the ROM Manager app after installation is complete.
5. 
   5
   Tap on “Partition SD Card.”
6. 
   6
   Select the desired size of your partition next to “Ext Size.”
7. 
   7
   Select a value next to “Swap Size,” if desired. Swap size is the amount of megabytes that can be used to cache memory to help free up RAM for other programs.
8. 
   8
   Tap on “OK.” Your Android device will enter recovery mode, and partition your SD card.
9. 
   9
   Select the option to reboot your device at the prompt. Your SD card will now be partitioned.
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Community Q&A

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• Question

  Can I partition an SD card without wiping its content?

  

  Denneisk

  Top Answerer

  Sadly, no. Backup the information onto a separate drive before partitioning it.

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Tips

• Back up all data on your SD card to your computer, cloud network, phone memory, or other storage location prior to creating a new partition. Partitioning your SD card will erase all data.
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