Corrupt raw files on Drobo 5c

Forum|Forum|7 years ago
August 9, 2018
3 replies
1942 views

I use a relatively new Drobo 5c as an archival disk, with tens of thousands of Canon raw files up to 13 years old. A noticeable number of these files are corrupt. When opened in photoshop, a portion or all of the photo is replaced by a white with colored, horizontal lines. This has not been a problem until a client wanted an image of someone who just passed away. And that file is corrupt or unusable. Is there a way to recover the file, and is there a way to prevent this? Thanks!

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A

Anthony C Holmes

Participant

I have also seen this problem when using Lightroom (and possibly Photoshop) using a Drobo 5N with Dual Disk redundancy connected via Wifi with my Lightroom Catalog running off local disk. The corrupted files are Canon Raws. The matching JPG is normally not corrupt (possibly never). The images appear corrupt in other (non-Adobe) programs. Sometimes if I am able to copy the "corrupt" file to another disk and back to the Drobo, the corruption disappears.

Producing a higher recovery rate: I used Chronosync to archive all my images to a portable hard drive and then restored them back to the Drobo and, as far as I can tell, ALL the corruption was cured. (But the problem still spontaneously happens while I use Lightroom.) Sometimes a Chronosync backup had to be run more than once to copy all images. (Some files produced errors or were skipped with a first run and successfully copied with a second run.)

I'm somewhat uncomfortable with my findings, as it doesn't match how I expect disks and software to fail/recover. But it offers some possibility that your (apparently corrupt) images aren't lost.

Semaphoric

Community Expert

Were the files okay when you initially transferred them to the Drobo?. Do you possibly have the original copy around somewhere?

Have you tried opening them in Canon Digital Photo Professional?

MarkBGardnerAuthor

Participant

Yes, they were ok when initially transferred, and for a while afterwards when I went back to work on them for the client. Unfortunately, I do not have the original file.

I did open in Canon Digital Photo as you suggested. The image is rendered differently than in Photoshop. More color, a bit more of the image showing through, but unusable.

Terri Stevens

Legend

The file shows the same regardless of how I view it - raw processor, lightroom, bridge, or explorer. All previews look fine at first, probably using the embedded jpg, then change to the corrupted version as the new preview is rendered.

what is the model of your Canon camera? What version of Photoshop are you using and what version of ACR(Adobe Camera Raw)? If you take a new photograph with the camera and use a card reader are the artefacts still there?

Terri

Terri Stevens

Legend

I don't know very much about the Drobo 5C except it is an network storage device. Normally these devices are fine for storage but too slow for the production environment with Photoshop. So the question is 'what happens when you copy a raw file from the NAS to your local hard drive'? Lines in raw images are often associated with GPU issues and so you could try disabling the GPU in your preferences.

Terri

MarkBGardnerAuthor

Participant

Thanks for the suggestions. Actually, the Drobo 5C is attached via USB 3.0 and is not NAS. I use it as an archival disk, not for production. Unfortunately, same result when I copied to my production (internal) hard drive. And I tried disabling the GPU. No change.

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