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Open terminal and use diskutil list to find the disk number of the SD card. Then change disk2 below to the number, making sure you physically disconnect any disks you can't afford to erase if you make a mistake with the numbers. diskutil eraseDisk MS-DOS UNTITLED disk2


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sometimes there is a tiny tab on the SD adapter (or standard SD card) that prevents read/write to the card. Make sure this isn't set to "lock." Otherwise: What version OS are you running? Can you write or delete files from the card?


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You can also try disabling Spotlight indexing for the SD card. While the card is inserted go to System Preferences->Spotlight->Privacy->'+' and add the drive.


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This may be a problem with Disk Utility.app and diskutil. I would recommend booting into recovery mode (CMD + R at startup) and verifying the main hard disk. If this turns up fine then a reinstall or restoring from a backup where the problem did not take place is the way to go.


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Bought a JetDrive Lite 130 and it fits seamlessly into the MB Pro 13" early 2011 card slot and is working fine.



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