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An SD Card (Secure Digital Card) is an ultra small flash memory card designed to provide high-capacity memory in a small size.

36 votes

Can't reformat SD card (Yosemite)

Get drive name diskutil list then try diskutil unmountDisk force /dev/DRIVENAME Then format diskutil eraseDisk JHFS+ Emptied /dev/DRIVENAME or diskutil eraseDisk FAT32 NEWNAME /dev/DRIVENAME
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