Bad Results after extended tests with Kingston Class 10s and 550D

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So despite initial tests, after an extended session with 5 separate cards I've discovered that these cards: http://www.overclockers.co.uk/showproduct.php?prodid=FL-083-KS actually can't read/write fast enough 100% of the time.

Has anyone else had this experience at all? This aside, could anyone who has the 550D let me know what cards they use for video on a regular basis please. No theory either, these should "theoretically work" but clearly don't.

Cheers,

Dave.
 
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from what i've read the "SanDisk Secure Digital High Capacity Card Extreme Video HD 16GB Class 10" is a very good card. it descripted as 30bm/s read and write but if you read the fine print it 20mb/s read and write. i read a review of someone who has use it on a nikon for video and he say that he hasn't had a problem with it. might be worth having a look at it. for what it worth i have "SanDisk Secure Digital High Capacity Card Extreme Video HD 8GB Class 8" for use with my 550d mainly for photos (RAW only) plus the odd long exposure and i haven't had a problem with it yet, im tempted to upgrade to 32gb class 10 version of the card.
 
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I'd also vote for the "SanDisk Secure Digital High Capacity Card Extreme Video HD 16GB Class 10" , got mine for £15.39 the other day from the river place and it was the 45mb version, does 1080p on my nex-5n fine as you'd expect
 
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Yeah I had a look at the details on these and they are meant to manage 15MB/s, and the camera is only meant to need 8MB/s tops.

By the looks of it I will need to try something like those Secure SanDisk cards, if you have had good experiences that makes me want to give it a go. Will have to sell these others first I think. Probably keep 1 or 2 for photos as they are fine with that, and even with fairly long exposures.
 
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