I just found that I have several thousand corrupted images. Luckily, I have multiple copies archived on drives and DVDs and can recover them pretty easily. The question is, how to do this, how this happened, and how to avoid in the future.
I have v.2 of DAM book on order (lost my v1 copy, but it's probably dated..), so I hope to avoid this in the future.
Here's the story:
1. Using Mac os 10.6.3 on 2x1.8ghz mac pro, following workflow based on DAM book v1, more or less: Ingest using LR into folders, burn to DVD when the folder reaches 4.6g.
2. Last month, I decided to move my images from internal SATA drives to an eSATA RAID 5. I copied the files to external drives temporarily, removed the internals and used them to make the RAID. All seemed to go well- no copying errors.
3. Last week, LR told me that a few files in a collection were unreadable. Sure enough, they wouldn't open in PS either, nor bridge, Expression Media won't build a preview, etc. They appear to be the same file size as non-corrupt images.
4. Luckily the archived copies are fine, so I simply have to restore from the drives/
5. I tried using DNG converter to verify the images, but it doesn't recognize them as image files. In other words, when I point it at a folder containing the corrupt files, it gives me an error message stating that the folder contains no image files. So, if I point it at the enclosing folder, it will simply skip the corrupt files. There is no error stating that there was a problem converting the file.
So my questions are:
1. How do I verify that the files on my RAID are corrupted or intact? Bridge? Expression Media?
2. When I do find and replace the corrupt files, how do I ensure that my LR adjusments are copied into the DNG data?
3. I will await v2 of the dam book to see how to copy files and verify
4. Do I need to occaisionally verify images on the RAID? and how?