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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
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This is a problem that you run into with some SD cards. I have two SD cards that are exactly the same and Disk Utility refuses to format them. The cards in question can be formatted in a camera but not with using Disk Utility. I also have a smaller SD card that can be formatted by Disk Utility.

The card that can be formatted is made by SanDisk, the ones that refuse to be formatted are made by PNY. The SanDisk is an "Ultra", while the PNY cards are "Premiums".
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