
by John Tworsky update 13 Mar 2008
Although digital cameras are highly reliable devices, occasionally, problems do occur.
Preventing errors:
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When you get the scary message "CARD ERROR" there is a very good chance that images can still be recovered from your media card. First, don't do anything with your card. Don't run Windows Scandisk or any other utility on your memory card. Don't format the card in your camera or computer. It is essential you don't do anything in order to maximize the chances for a good recovery.
Bring your card in to Bergen County Camera where we can use a special Hex Editing program to search your card for files or where you can purchase a Memory Card Recovery Program for $39.95 and attempt the job yourself. The price for recovery ranges from $5 when no problem is found and files are simply written to a CD to $30 for a basic recovery of up to 256mb. There is no guarantee that you will be able to recover files but there are some things you can do to MAXIMIZE your chances of recovery before you run into trouble.
The best approach is to archive your images on the memory card to CD or some other safe media. Once you're certain the images are all copied, you should FORMAT your card. Formatting the card sets the card up to receive new images in sequential order. This means that the picture is stored in one complete area on the disk. Over time if you frequently erase and retake many pictures, the camera is unable to save the files in one complete piece and needs to store it in several pieces or FRAGMENTS on the memory card. Its always best to format in your camera rather than in your computer.
Should the media become corrupted, the recovery software can only recover the first portion of a fragmented file. An example of an image recovered from a fragmented file is shown below.

This is an example of a recovered image that is FRAGMENTED

Here's a map of the memory card with RED showing areas of fragmentation, BLUE for contiguous and white for empty space.
The image below was recovered from a media card containing nothing but CONTIGUOUS files


Here's a map of a memory card with all files saved CONTIGUOUSLY which means no file fragments affording you the best chance of a full recovery.