See instructions below on how to format a SD card or USB flash device. We recommend using FAT32.
In Disk Utility on your Mac, you can format an external disk for a Windows computer.
WARNING: Formatting a disk or volume erases all the files on it. Save any files you need to another volume before formatting.
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In the Disk Utility app
on your Mac, choose View > Show All Devices. -
In the sidebar, select the disk you want to format to use with Windows computers.
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Click the Erase button
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Click the Scheme pop-up menu, then choose Master Boot Record.
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Click the Format pop-up menu, then choose one of the following:
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MS-DOS (FAT32)
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Enter a name for the volume.
The maximum length for the volume name is 11 characters.
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Click Erase, then click Done.
