I always format cards in the camera. corrupt files come from 3 different sandisk extreme IV. so it shouldn't be a card problem
What do you mean 'wiped'?
I've done 'verify permissions' and 'repair disk' on both computers.
I haven't tried different ports but i did copy files via wifi, the same problem. so it shouldn't be a transfer issue.
please note that from cf to macbook everything is ok. the problem occurs when the files are being copied from macbook to imac.
could it be some weird imac hardware failure? imac seems ok except the raw issue.
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crap. I got nothin.
It seems like you've totally covered the bases. The next step would be to try the files on another machine entirely, to see if it's a problem with the iMac specifically.
("Wiping" a memory card means using a utility to actually write data to the card, to over-write any file fragments... technically a format just rebuilds the directory, it does not erase any data, and sometimes the data has bits, bytes and pieces all over the card. The early Canon cameras, I'm talking D30 here, needed a periodic wiping to avoid CF issues. Doesn't sound like your problem at all...)
Hold on... Do they look the same in Finder, and other applications? Have you tried opening them in Photoshop? Wondering if it is Bridge issue, on the iMac.
Jeesh... sorry, one other thought. Take one of the files on the iMac and transfer it back to the MBP. Is it corrupt? (again, trying to isolate the iMac)