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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 310680" data-attributes="member: 13090">I'd like to clear up some confusion about what formatting an SD card in the camera does versus what doing a full format on a PC does.Formatting in the camera simply overwrites the MFT (Master File Table), so the card appears blank to the camera's software, and creates the directory structure for file storage; it does not overwrite anything else. Formatting in the camera does not perform a CRC (Cyclic Redundancy Check), or any other kind of error checking.Formatting in the computer using the full format option fully rewrites the card file structure and checks for structural integrity of that file structure. Fully formatting a 32GB card using the my home PC takes about half an hour. I assure you my D7100 is not accomplishing that same task in under two seconds.SD cards come from the factory formatted in what's known as FAT32; a specific, standardized file-format. If you were to put your SD card in your computer and re-format it to, say, NTFS, a totally different file-format and then try to format that same card again in your camera the operation would fail. Why? Because the camera will be expecting a card that has already been formatted to FAT32; it will freak out when it sees an NTFS formatted SD card and simply return an error because formatting in-camera is not really formatting at all; it's simply erasing the Master File Table. If formatting in the camera was the same thing as formatting in the PC it would probably hours to accomplish and it wouldn't matter if the card had been formatted in some other way because the formatting would just overwrite it and go along it's merry way.So no... Formatting in the computer and formatting the camera are two very different things: In camera formatting overwrites the MFT so the card appears blank and ready to use. It's a good idea to keep the MFT clean and over writing prevents corruption. It also recreates the folder structure the camera needs for storage.Formatting in the computer using the full format option rewrites the SD cards native file structure from the ground up but does NOT create the folder structure necessary for storage. I only re-format my SD cards in my computer every few months or so, I reformat my cards in-camera most every time I use them....</blockquote>

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