WTH.. How could this happen? I dont get it.
Me too.
I'm certainly glad BekahAura was able to recover her photos.
Is there a proper procedure that should be followed with Memory cards? My usual procedure after a shoot is to download all the pictures to my computer. I then delete them from the folder their in, but don't delete the folder nor the directory. The last time I formatted the card was when I bought it.
Agreed...good her pix were recovered. (Post any??)
It's a good idea to format the card...more than the first time when it's new. I'm a casual photog, but I typically format after every upload to my computer....just after I've verified the pix transfer from the card was successful.
In general, a storage device like a memory card or a hard disk uses a storage structure which includes 1) a directory...the list/map of where the camera or computer can find files on the device, and 2) the file itself. Since files/pix come in various sizes, the file/image is saved in the next largest unused space on the card. If there are other files/pix on the card, then sometimes there won't be a single empty space on the card large enough for save the image in a single chunk of physical space. So, the storage system (both cameras and computers) is designed to carve up the file/image and put the pieces in the space that's available on the device. Then, the directory keeps track of where all the piece reside and will automatically rebuild the file so that when you call it up to view the image on the camera's viewer or on a computer, the file/image is returned like one big image....just like the original. The ugly details are less obvious since folks don't (and shouldn't) care about them.
This is all happens at the blink of an eye and it's how computers have been operating for many years. It's a reliable system 99.999% of the time (don't quote me on that figure).
However, as the card or HD gets full, there's typically a lot of info carved into more little pieces...more than usual. Then if a new image needs to be saved, the available storage space is spread over lots and lots of little pieces instead of one big empty chunk. That's why your computer has a disk defragger utility. Defragging a HD will attempt to consolidate files saved in lots of little pieces all over the HD, to single bigger pieces. For example, say your 100G disk had 90G of stuff on it. Most folks would look at it and say "oh...there's 10G free, I can save this 10G file". However, in truth, the 10G of free space is NOT sitting in one open 10G chunk of space on the HD, it's actually sitting in 10 1G chunks....or 100 100M chunks....or 10,000... You get the idea. Defragging a disk trys to consolidate the open space and "free up" these many little pieces of free space. That's also why a computer will tend to slow down as the HD get full....it simply takes more computer cycles to keep straight the many more pieces, and less free chunks of space, associated with all the files it uses. (That's also why the computer-tech will first recommend doing a defrag for a slow computer.)
Camera storage cards use these same structures.....and they're subject to the same issues...and 99.99% reliability (don't quote me on that figure). Yes, today's DSLRs ARE little computers (designed for a single purpose).
What does formating do? It wipes the slate clean by rebuilding (sofware-wise), the directory and emptying the file storage area. When you erase an image/file, it simply removes the directory entry for the single image. When you format, it destoys the old directory (and all the files it was keeping track of) and rebuilds it...then, it "smooths over" the file/image storage area (I think of it as a clear glass lake w/o waves). Instant do-over...and ready to store a bunch of new images.
So, to my way of thinking...providing a fresh new clean storage area before each shoot is the best way of minimizing any chance of an "issue" stealing away my photos.
$0.02 from a non-expert.