Very sorry to hear about that.
Back in the old days of film, we were so paranoid about losing work that I sent jobs out on separate days, with the idea that no one job would ever have all its images held by the same courier or processed by the lab at a single time.
Since converting to digital ten years ago this year, we've never had a problem where we permanently lost images. We might have lost a set of images, but backups have saved our butts!
One of the things I REALLY like about my 1DII N and 1DsII bodies is that they both have two cards slots. I set them for dual file writing (or "backup" mode), in which every image is written to both cards simultaneously. In the 8MP 1DIIN, I use 8GB SD and CF cards. In the 16.7MP 1DsII, I use 16MB SD and CF cards. After a job, the cameras go back into their cases with the CFs, but the SDs go into a pouch and into my pocket. While no method is foolproof, this does provide me with a reasonable amount of assurance.
I don't know what camera you use, and yours may not have dual slots. If not, I cannot recommend enough a backup agent in both the field and studio. Acer One netbooks are great in this respect, featuring reasonably large harddrives and built in SC card slots. (And it doesn't hurt to have a monitor for image viewing.) At just over $200 these days, they're cheap for the protection they provide.
Again, I'm sorry for the loss. Best of luck in the future.
I just lost 17 portrait sessions from this past weekend due to a bad Lexar compact flash card. This is the second one that has gone bad on me in the past six months. Both times they have come apart on me, exposing the inner workings. I took the card to a professional recovery service gladly willing to pay the $500.00 fee for recovering the files but yet the images are unrecoverable..... I have been sick to my stomach for 3 days now. I have about 30 or so compact cards of various brands and it seems I only have trouble with the Lexar brand.... Im not saying they are a bad brand but just want to let some users know to be aware and to be on the look out of them splitting open. Gotta go cry some more now.....
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Michael Thomas Mitchell