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FORUMS Canon Cameras, Lenses & Accessories Canon Accessories 
Thread started 15 Mar 2009 (Sunday) 01:34
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can a UDMA card be used in a non-UDMA device?

 
mrkgoo
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Mar 15, 2009 01:34 |  #1

Basically, I want to know if the San Disk Extreme IV UDMA can be used in a 40D. I know it won't be able to access the extra speed, but it will still work, won't it? There's no such thing as a UDMA-ONLY card?

I only ask because I see CF Extreme IV with and without UDMA added to the name afterwards, and was wondering if the latest ExtremeIV was like an ONLY UDMA or something.

I know it won't get the speeds for the 40D, but for the current rebates, it might be worth getting the Extreme IV for better future compatibility (I'm not one to normally go for future-proofing, but the rebates make it pretty worthwhile).




  
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swalter
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Location: San Diego, CA
     
Mar 15, 2009 01:40 |  #2

Yes, UDMA is an optional mode for compact flash and all cards are backwards compatible. I've used Sandisk Extreme IV cards in my 20D.

Wikipedia has a lot more technical details
http://en.wikipedia.or​g/wiki/Compact_flash (external link)


http://scwalter.smugmu​g.com/ (external link)

  
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mrkgoo
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Mar 15, 2009 01:41 |  #3

Thanks for the info.




  
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overclock
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Location: Fort Worth, TX
     
Mar 15, 2009 10:52 |  #4

Get a UDMA reader as well. The transfer speeds are amazing with a UDMA reader. I have both a FireWire and a USB UDMA reader and both rock.




  
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can a UDMA card be used in a non-UDMA device?
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