600d w/ 64gb class 10 stops recording video after 4 seconds???

[d4mer]

Hi everybody,

I have a 600d and just bought a Transcend 64gb class 10 card, ML is working fine however with default cbr I can't get it to record more than 4 seconds before the buffer gets full. I have a 8gb class 6 microsd that works just fine at the same settings 1080/24.

Any suggestions?

Thanks

[Walter Schulz]

"Class 10" is next to useless as a classification today. It's just saying that highest write speed has to be 10 MByte/s. Class 6 -> 6 MByte/s.
600D has a bottleneck built in and that's the card interface itself. https://docs.google.com/spreadsheet/ccc?key=0AgQ2MOkAZTFHdFFIcFp1d0R5TzVPTVJXOEVyUndteGc#gid=5
You will just get about 21 MByte/s in the cam. If the card does 90 MByte/s with an USB 3.0 cardreader does not change anything about this one.

Take a decent USB 3.0 cardreader (Kingston FCR-HS3 works fine for me) and run something like ATTO or CrystalDiskMark. If the card fails to write 10 MByte/s in sequential mode it is a bad joke and you may return it or use it for other things.

Ciao
Walter

[Datadogie]

i think you have a bad card. Some are not what they say they are.

[d4mer]

I was seriously afraid of that! The package says its 20mbp/s but it gets nowhere near that. I can get it  to record if I bring down the cbr to .9.

How big of a difference will that make to picture quality?

[Walter Schulz]

The package says its 20mbp/s

Read or write rate? There might be a big difference.
Debug tab has a card benchmark. Run it and it will generate a BMP file on the card's root directory.

[d4mer]

Thanks for that Walter,

However I was just looking through the debug menu and can't find anything like a benchmark test for the card. Could you point me in the right direction?

[Audionut]

You will need to install a nightly build.

[d4mer]

Got it! Thanks for clearing that up Audionut.

And from what I can see this card is CRAP!

15 read and 5 write. Am packing it up and sending it back as we speak

Thanks for all your help guys! 

[Walter Schulz]

15/5? Are these the highest marks go got or the worst? Last run (128k buffer size) might be giving very low numbers and that's quite normal.

Ciao
Walter

[d4mer]

These are the best! And they have never gone over  5.1 on the write