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If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device. Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase-it’s at the top of the hierarchy.Ĭlick the Format pop-up menu, then choose a file system format. On the left sidebar, you may see your SD card with a partition under it. Select the card and click on the Erase button at the top toolbar. Open Finder - the macOS version of Windows File Explorer, go to Applications > Utilities folder, then launch Disk Utility. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. Here is how to format SD card to FAT32 on Mac: 1. In the sidebar, select the storage device you want to erase, then click the Erase button. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder.

Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant.