Have you reformatted the cards recently?

Greg

This really sounds like a computer software/hardware problem rather than
anything to do with your camera.

I'm guessing you are dragging the files in Explorer?
Try using xcopy in a command window with the /V option to verify each
file as it is copied.

Hi all. WE ARE HAVING THE SAME PROBLEM WITH A MAC, and so are a couple
of other pro Mac users that we work with.  It's the camera. We don't
have the problem with our Canon Mark 2 or 5D. Or for that matter the
20D that we no longer own. Just the 30D exhibits this problem.  I am
guessing that a firmware update is in order. Regards,  David

Having spent some time looking further into this problem I have come to the conclusion that the problem must lie somewhere within the30D firmware.

My initial reaction was that Windows was not copying the files correctly but if this was the case

1.                    Why would Windows correctly copy the so-called corrupted file when ask to do so?

2.                    If Windows was to blame I would expect to be having the same problem with other files I copy in windows, as far as I am aware I am not.

3.                    Once I have got a full set of non-corrupt files on hard disk I can copy them several times using Windows with no problems at all.

4.                    I have copied my compact flash card directly on to my FlashTrax, when I connect the FlashTrax via a USB port and get DPP to read the FlashTrax hard disk I get the same problem.

I therefore came to the conclusion that if it was not Windows there were 4 other possibilities

1.                    There is a fault in DPP, I soon eliminated this as other imaging software also saw the corrupt JPG files as corrupt. I cannot say about the RAW files as DPP is the only software I currently have that will read 30D RAW files.

2.                    My card reader is faulty but as I get the same problem when using my FlashTrax then this eliminates that possibility.

3.                    There is a problem with the Compact flash Card I am using.

4.                    There is a problem with the way the 30D writes files to the Compact Flash card such that when being read it can be misinterpreted.

Today I have eliminated the second of these, I have been out and taken a series of images and used two different Compact Flash Cards. One is a 1GB SanDisk which was brand new when I first started using the 30D, the other is a Kingston 512MB which I previously used without problem on my 300D. In both cases before taking any pictures I formatted the Compact Flash card in the camera. In both cases having returned home when I download the Compact flash Cards to my hard drive using my card reader I get 4 or 5 files that are shown as corrupt in DPP.

This therefore only leaves one other possibility and that is the way the 30D firmware writes images to the Compact Flash Card.

Tony Falla

Having spent the last week or so experimenting I am a little bit closer to
solving this problem.

I am now convinced that it has nothing to do with the 30D, some images that
I downloaded from a friends 30D exhibit the same problem.

Where I think the problem lies is with the USB ports on my PC. It is
difficult to say exactly what as I never get consistent results but have
found that it happens on both sets of ports on my PC. It only happens on my
PC I can download to my laptop and to a friend's PC using various methods
and have no problems at all.

What is even more curious is that I also borrowed a card reader which runs a
lot slower than mine. (Mine takes about 3 - 4 mins to download a card, this
one takes 9 - 10 mins). If I use the slower card reader on my PC again I do
not have any problems.
My Flashtrax which performs the fastest download (about 1 min) is
inconsistent sometimes no problem others a few corrupt images.

It looks as though I need to do some investigating of USB.

Thanks to everybody who offered advice

Tony Falla