I recently had a hard drive go bad on me which actually turned out to be a hard drive going bad. There was definitely something goofy going on with access to the drive. I keep daily backups but a perfect backup of a corrupted source is no good. My most important files are my digital photos, mostly JPG images. I did some visual spot checking but once I hit the 1500 photos I looked for a better alternative. Here’s what I came up with. (This works on Linux. You’ll have to alter your process on Windows and Macs but the principles are the same.)
First, find a nifty little utility called jpeginfo and install it. jpeginfo is a command line program that attempts to quickly decompress a JPG file and tell you what happens. It’s not infallible, but I’m betting that if the JPG file decompresses successfully then the files are good.
Then you just open a shell, cd to your photos directory and run jpeginfo -c on all of your files. Like so:
cd photos find -iname "*.jpg" -print0 | xargs -0 jpeginfo -c | grep -e WARNING -e ERROR
Any corrupted JPG files will be listed.
How it works: the find command lists all files ending with .jpg (case insensitive). It passes it to xargs which runs jpeginfo -con each file. The grep command shows just the files that had a WARNING. Instead of grep WARNING you could also redirect the output to a file so that you can see all of the results.
I found 400 corrupted JPGs in my collection of over 135,000 photos. I knew about some of these.
So this method helped me so save a lot of time and I would like to share this with you.