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Using Magic Lantern => Hardware and Accessories => Topic started by: anderSF on February 27, 2015, 06:39:42 PM

Title: USB 3.0 card reader + USB 2.0 MacBook = Corrupt cards?
Post by: anderSF on February 27, 2015, 06:39:42 PM
Hi!

I have a USB 3.0 card reader, but my laptop only supports USB 2.0. Will I risk ruining my KB 1000x 64gb cards with this combo?

I'm guessing the answer is yes, but seeing as I haven't fully understood why using a USB 2.0 card reader could damage the cards in the first place, I'm not 100% sure... But I'd like to be!

- Anders
Title: Re: USB 3.0 card reader + USB 2.0 MacBook = Corrupt cards?
Post by: Walter Schulz on February 27, 2015, 06:44:07 PM
It doesn't matter if your interface is 2.0 or 3.0. The important thing is to use cardreaders supporting UDMA-7! As label on CFcard case provided by KB tells.
Title: Re: USB 3.0 card reader + USB 2.0 MacBook = Corrupt cards?
Post by: DeafEyeJedi on February 27, 2015, 11:40:58 PM
I've used a USB 3.0 hoodman card reader hooked onto a USB 2.0 port in my MBP -- works fine but obviously takes longer to transfer than USB 3.0!
Title: Re: USB 3.0 card reader + USB 2.0 MacBook = Corrupt cards?
Post by: chris_overseas on February 28, 2015, 01:01:32 PM
As far as I have been able to figure out, the issue is putting a UDMA7 card into certain USB 2.0 card readers. As long as the card reader is USB 3.0 then (apart from transfer speed) there isn't a problem with connecting it to a USB 2.0 port.
Title: Re: USB 3.0 card reader + USB 2.0 MacBook = Corrupt cards?
Post by: Walter Schulz on February 28, 2015, 01:16:40 PM
That's not quite right. Some USB 3.0 cardreaders may need firmware update to support UDMA-7.
Therefore: There are USB 3.0 cardreaders able to damage the card. Run a web search and you will find several issues.
Title: Re: USB 3.0 card reader + USB 2.0 MacBook = Corrupt cards?
Post by: anderSF on March 02, 2015, 04:32:36 PM
Thanks! I have Lexars UDMA 7-reader, so I feel confident  8)