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How do you know that it was the card that did this?

Fair question and one that has been troubling me. All I can go on is my personal experience with other cards and the camera. I have shot quite a lot of footage and timelapse material with the camera considering it was only purchased 3-4 months ago (one of the last from B & H). I have used ML more often than not with no major issues. I have had no issues with other cards. The fact that the camera was working with a Lexar card just hours before, and when i booted it up with the formatted Komputerbay card the card reader fault occurred is the most direct reason the card is suspect. The fact that it also took my external card reader out when I tried to format the Komputerbay card and took a very long time to boot up on yet another internal card reader (on a Windows work station) all point to card fault in my mind.

That said here are nagging questions- is this card too fast/ large for a 5D MK II? Could the camera already have had a fault in it's card reader? Maybe this is a knock-off card in some way as I did not purchase it directly from Komputerbay?

Notes that counter these questions- Card appears to have also caused a short in external card reader. Camera was in working order even with a heavy transfer load (ML RAW hack, RAW timelapse capture) with Lexar cards and had been in heavy use with no issues prior to this.

Of course without any electronics training the only way I can test it is to put it back in the camera and let it break it again to confirm that the Komputerbay card is to blame. Obviously I am not going to do it so my best hope is to send it to Komputerbay for testing along with supporting documentation and hope they find something out of the ordinary and pay for the damages.

'And maybe after I've pulled off that miracle, I'll go and punch out God'.

Have you contacted Komputerbay about this? I've had 2 of those cards since June and no problems thus far, although I got mine from the Kompbay shop on Amazon.

Sorry for delay. I have contacted the e-bay retailer to confirm that he is a licensed re-seller of Komputerbay cards and that the 'lifetime guarantee' advertised on his site is with Komputerbay rather than him. I am now waiting for the camera shop to forward me on all communications they have had with Canon UK as well as their repair report. When I have all this documentation I will contact Komputerbay so that I will be able to make as strong a case as possible. There is no hard case and they could simply tell me to take a walk (which is what I'm expecting). All I can say is that the camera was working. I inserted the Komputerbay card into the camera, and without even recording any data to the card (just powered up the camera) camera is not working.

I know they're a good deal but it's just not worth the risk to me so I have since shelled out $400+ for two Lexar 1000x 32gig cards for piece of mind alone.

Hi guys, just wanted to drop a warning to ML 5D Mk II users. ***Beware of Komputerbay Cards***. I recently purchased the KOMPUTERBAY 64GB Professional COMPACT FLASH CARD CF 1000X 150MB/s Extreme Speed from an Ebay retailer with an excellent rating. I used this card 4-5 times in all manner of modes (using the RAW hack, with ML's intervalometer for RAW timelapse capture and standard 1080 video mode with ML wiped from the card).

I inserted the card into the camera a few weeks ago and got a 'format card' error. The camera could not format the card. Popped the card into an external CF reader and the card could not be read. Tried a different card (Lexar 1000x UDMA 7) in the cam and got the same error.

Sent it into camera shop for repair after trying and failing to problem solve the issue (no bent pins etc). Tech in store conducted a quick test and reported the internal card reader of 5D mk II was fried. Went to Canon UK for repair and this POS card has now cost me €450 in repairs ($600). Turns out the card also blew my card reader so round that off to a cool $650.

From extensive reading it seems Lexar UDMA 7 cards are getting less failures than Sandisk Extreme Pro once firmware is updated to most current version. This issue also very nearly destroyed data shot in a one-off way for a client, took my camera out of action for 6 weeks causing me to use my lower spec b-cam for two other jobs and has been a very stressful road. I'm willing to take a risk using ML on paid gigs for the control it gives me but I won't be so stupid to use knock-off cards in the future, cheaper to cough up and buy Canon-approved cards from a respected seller IMHO. Just wanted to share with you guys so no-one else has to go through this.