Downloading images from Canon EOS 7D camera results in corrupted images.

Hi,
I'm struggling to download images from my Canon EOS 7D camera. The images appear corrupted on my hard drive. This does not happen consistently. Some images get corrupted, but could appear properly when trying a second time. The errors occur in EOS Utility or in iPhoto: same (bad) result. I tried to repeat downloading on a Windows machine (separate) and in a Ubuntu environment (Virtual Machine on my mac). In both cases, I had no problem. Canon states that the problem resides in my iMac. The dealer of my camera mentioned that if they see those problems, it usually relates to bad connections or a poor USB cable. I also tried several USB ports and cables, but could not resolve the problem that way. Any suggestions?
Thanks.

I've had this issue a few times and found it falls in to a few buckets, just a few things to consider if the images show up fine in the camera but not when you copy them out.
1) The format (version of RAW in my case I was using with Aperture
2) The reader
3) The drive
4) The connection
Format: when I first got the 7d I wanted to use the RAW.2 version. The .CR2 file format (Canon RAW version 2) is a digital photography RAW format created by Canon. "RAW" here means that this file stores information directly coming from the sensor, almost without processing. This file would show up corrupt every time i tried to open in in Aperture, or IPhoto on my Power-Mac
G5. I could only open it up in the supplied Canon software After some poking around I found out that I had to upgrade to Aperture3 to get the new supported RAW formats. Since I can't buy a new mack I changed the version of RAW I used.
Once I changed from using that RAW format it was fine. There are times Aperture will say that the file is corrupt but
when I restart the application it is fine I think there are some memory issues when it does this and I have to reboot the application over time.
The READER:I used to use a USB reader which was fine for the 10D but with the 7D and the 5D the files are much larger in RAW from 10 megs on the 10D to 25 megs or more on the 7D/5DMk2. After shooting 500 - 1000 shots in a night I'd have to download overnight in order to get everything. Some times the file would be corrupted coming over. If I pulled the file off later one by one or in smaller groups it would be fine. I have since upgraded to a Firwire 800 cards reader. Hours becomes 10 minutes for a 16Gig fill loaded card. not 8-10 hours.
The Drive: I've seen every files copy except 1, if I am able to hook up another drive and it works I run DiskWarrior, TechTool or SoftRAID. Usually thy confirm a bad sector in the drive. I'll back up the drive with time machine or a disk dupe software and then format the drive it it's part of a RAID I replace the drive entirely from the chain.
The connection: bad cables have also been a culprit but not often with firewire.

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Downloading images from Canon EOS 7D camera results in corrupted images.

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