It’s also useful when you want to gift someone one of your old SD cards, but want to make sure it’s been wiped of all your old files. Regular (re)formatting keeps your SD card operating at its best and helps to keep the files from becoming corrupt. That’s why it’s important to make sure your memory cards are formatted correctly and ready to go! We all know what’s like to have taken off for a shoot and found that we either forgot our SD card or it’s not working properly. At this point you can close your Terminal and open the Disk Utility application to create an exFAT partition like you were trying to do earlier.SD cards are something most of us can’t do without in today’s photography world. Once the previous command completes, the card should be completely erased and ready for formatting.(64 x 1000 / n) / 60 = minutes until it finishes where n is the rate in MB that you just determined or 5 in my example At the bottom you should see the Data written/sec in red. You can estimate time by opening the "Activity Monitor" application in Utilities and clicking on the "Disk" tab. You should be prompted for your password to run this command because it is dangerous Note the 'r' in front of the rdisk in case you are typing this by hand instead of copy/pasting the text. Enter the following sudo dd if=/dev/zero of=/dev/rdisk# bs=64k and be sure to replace the # with the previous disk number. Here is where you must be VERY CAREFUL.
Now type diskutil unmountDisk /dev/disk# where # is the number you determined earlier.
You should be looking in the left most column for something like /dev/disk3 or 4 or 5 etc.
Open a Terminal window and type diskutil list.Before inserting the SD card into your Mac, make sure that the write protect (lock) switch is turned off.Warning, erasing the wrong drive could make you cry so make sure that you know what you are doing. The following procedure should format your SD card to make it usable again and cause bad sectors on the card to be remapped if that is part of your problem.
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