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  1. #1
    Join Date
    Feb 2006
    Location
    Melbourne, Australia
    Posts
    3

    How to "uncorrupt files"

    Does anyone have any experience with corrupted files?
    While on holidays I used an internet cafe to burn RAW files onto DVD once my CF cards were all filled up.
    Only when I returned home did I discover that one of the two folders on one of the two DVDs (containing the RAW files from a 2 gig SanDisk CF) had somehow been corrupted.
    I've tried opening these files in every program I could think of (Bridge, Photoshop, Preview, Canon Software, I-Photo, Adobe DNG Converter), and also on a PC as well as my Mac, and nothing will recognise them.
    Since burning the DVD the CF has been erased and refilled a couple of times, so the files only exist now on the DVD.
    Does anyone know how I might be able to save these files - of course they're the best shots from the trip!

  2. #2
    Join Date
    Jul 2004
    Location
    Formerly South Wales. Now South Carolina.
    Posts
    7,147
    Quote Originally Posted by DrewDrew
    Does anyone have any experience with corrupted files?
    While on holidays I used an internet cafe to burn RAW files onto DVD once my CF cards were all filled up.
    Only when I returned home did I discover that one of the two folders on one of the two DVDs (containing the RAW files from a 2 gig SanDisk CF) had somehow been corrupted.
    I've tried opening these files in every program I could think of (Bridge, Photoshop, Preview, Canon Software, I-Photo, Adobe DNG Converter), and also on a PC as well as my Mac, and nothing will recognise them.
    Since burning the DVD the CF has been erased and refilled a couple of times, so the files only exist now on the DVD.
    Does anyone know how I might be able to save these files - of course they're the best shots from the trip!
    You've done virtually everything you can as a home user. There are programs like "image rescue" around but that only (as far as I know) works with JPEG. You need to contact Canon or a specialist data recovery company. This is one of the big problems with RAW - half the data is encrypted and not so easy to recover. Also, try the Linux community - the geeks there relish a challenge and relish proving to windows users why their egos are bigger.

  3. #3
    Join Date
    Jul 2005
    Posts
    6,590
    It totally depends on how they are corrupted of course... if you have a Canon camera, you can email me one of your files so I can have a peek inside if they look like Canon RAW or not, and if they can be "fixed" in an easy manner.
    Canon EOS 350D, Tamron SP AF 90mm F/2.8 macro, Sigma 18-50mm F2.8 DC EX, Canon EF 70-200mm f/4 L USM, Tokina AT-X124 Pro 12-24mm F4, Soligor 1.7x C/D4 DG Teleconvertor, Manfrotto 724B tripod, Canon Powershot S30

  4. #4
    Join Date
    Jul 2004
    Location
    Monterey Bay
    Posts
    6,027
    I recommend that you try Photo Rescue here.

    http://www.datarescue.com/photorescue/

    I have used it several times, and it works fine.
    D7000, D70, CP990, CP900, FE.
    50mm f/1.8, Sigma 18-125, Sigma 24-70 f/2.8, Nikon 18-105 VR, Nikon 55-200 VR, Nikon 43-86 f/3.5 AiS, Vivitar 28-90 F/2.8-3.5 Macro, Vivitar 75-205 F/3.8-4.8, SB800.
    Ha! See, I can change...


    http://d70fan.smugmug.com/

  5. #5
    Join Date
    Jul 2005
    Posts
    6,590
    Tools like photorescue work when the problem is a FAT corruption problem or if you have deleted files on a FAT volume.

    The DVD is not a simple FAT disk, so you can not get any files from it using a tool like that. If the original poster can copy the files from the DVD but can not get programs to recognize them as RAW files, then the file itself is corrupted in some way or another, and it is then not the file system that can not locate the files while trying to read them.

    So, first try if you can copy them. If you can normally copy them, then the file itself is corrupted in some way, and then send me a copy so I can compare it with a Canon RAW file of my own.
    Canon EOS 350D, Tamron SP AF 90mm F/2.8 macro, Sigma 18-50mm F2.8 DC EX, Canon EF 70-200mm f/4 L USM, Tokina AT-X124 Pro 12-24mm F4, Soligor 1.7x C/D4 DG Teleconvertor, Manfrotto 724B tripod, Canon Powershot S30

  6. #6
    Join Date
    Feb 2006
    Location
    Melbourne, Australia
    Posts
    3
    Thanks coldrain,

    Yes, I can copy the files from the DVD, and they are Canon RAW files (CR2). As long as you don't mind receiving an 8 meg attachment I'd be happy to email one to you for you to look at. Is that okay?

  7. #7
    Join Date
    Jul 2005
    Posts
    6,590
    Yes, that is ok. I can receive emails that big in the email in my profile.
    Canon EOS 350D, Tamron SP AF 90mm F/2.8 macro, Sigma 18-50mm F2.8 DC EX, Canon EF 70-200mm f/4 L USM, Tokina AT-X124 Pro 12-24mm F4, Soligor 1.7x C/D4 DG Teleconvertor, Manfrotto 724B tripod, Canon Powershot S30

  8. #8
    Join Date
    Jul 2005
    Posts
    6,590
    I am afraid I have some very bad news for you. The file you sent me is filled with zeros, nothing else. Since on a written DVD you only can get to sectors that have actually been written, it can not be a damaged file structure on the dvd returning wrong sectors, since there can not be 8mb worth of empty sectors unless they have been written empty.

    I do not know how this has happened, but it seems that you have lost a lot of photos that are unrecoverable from the DVD. What OS do you use to read from that DVD?

    The only other explanation I can think of is that your OS while trying to copy the file allocates an empty file, fails to read and therefor copy the contents, and then does not return an error message to you. But, it is hard to tell without actually having the DVD to examine its contents.
    Last edited by coldrain; 02-28-2006 at 07:23 AM.
    Canon EOS 350D, Tamron SP AF 90mm F/2.8 macro, Sigma 18-50mm F2.8 DC EX, Canon EF 70-200mm f/4 L USM, Tokina AT-X124 Pro 12-24mm F4, Soligor 1.7x C/D4 DG Teleconvertor, Manfrotto 724B tripod, Canon Powershot S30

  9. #9
    Join Date
    Jul 2004
    Location
    Formerly South Wales. Now South Carolina.
    Posts
    7,147
    Quote Originally Posted by DrewDrew
    I used an internet cafe to burn RAW files onto DVD once my CF cards were all filled up.
    Only when I returned home did I discover that one of the two folders on one of the two DVDs (containing the RAW files from a 2 gig SanDisk CF) had somehow been corrupted.
    It is a dreadful shame that this happened to you. Perhaps this is your cue to invest in more CF cards or in some reliable databank for your photos?

  10. #10
    Join Date
    Mar 2005
    Location
    Georgetown, KY
    Posts
    1,627
    Quote Originally Posted by coldrain
    It totally depends on how they are corrupted of course... if you have a Canon camera, you can email me one of your files so I can have a peek inside if they look like Canon RAW or not, and if they can be "fixed" in an easy manner.
    coldrain - I hate to jump in here and ask also, but would you mind if I sent you one to look at. I was on a trip to the New Mexico area week before last & ended up with several corruptions. I transferred from a Sandisk UltraII 1G to a Jobo GigaOne (40g). They are Canon RAW and I get 2 different results. Some will say corrupted and won't open and then some will open but are severely messed up. I use DPP.

    Thanks,
    Dennis

    Canon 5D
    Canon 20D


    Georgetown, KY Photographer
    Retouching

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