SD memory card question

Discussion in 'Digital SLR' started by eatmorepies, Aug 18, 2010.

  1. eatmorepies

    eatmorepies Guest

    I've just received a new SD card from an Amazon supplier. The listing was
    for a 4GB class 10 30mb/s card - a class 6 30mb/s card has arrived. They are
    both 30mb/s, what's the class 6 and class 10 telling me? I can't even find a
    class 6 30mb/s on the Sandisk website.

    John
     
    eatmorepies, Aug 18, 2010
    #1
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  2. I've just received a new SD card from an Amazon supplier. The listing
    Does this page help?

    http://www.sdcard.org/developers/tech/speed_class/

    Class 10 appears to have a "High Speed Bus I/F" (but it doesn't say what
    speed interface "High Speed" is), and class 6 a "Normal Speed". Seems to
    me that class 6 would not be as good for some applications, but probably
    quite adequate for still camera use.

    Cheers,
    David
     
    David J Taylor, Aug 18, 2010
    #2
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  3. eatmorepies

    eatmorepies Guest

    Thanks for that. I'm still puzzled by the lack of this particular card on
    the Sandisk website. Does class6 do 30mb/s? Is it old stock and hence no
    longer listed with Sandisk? Is the card a fake? The supplier was through
    Amazon so they should be ok. I will contact Sandisk and see if they ever
    produced such a card.

    John
     
    eatmorepies, Aug 18, 2010
    #3
  4. Thanks for that. I'm still puzzled by the lack of this particular card
    Yes, worth checking - but these cards change so rapidly I /think/ you will
    be OK. A test program I've used is:

    h2testw.exe (free)
    http://www.heise.de/software/download/h2testw/50539

    which will find cards which have less memory than advertised, and:

    HD Tune 2.55 (free)
    http://www.hdtune.com/download.html

    for additional speed tests.

    Cheers,
    David
     
    David J Taylor, Aug 18, 2010
    #4
  5. eatmorepies

    eatmorepies Guest


    Thanks again. Things have moved on. I sent a question to Sandisk, the form I
    completed did list the card I've received. I read around the class issue and
    it appears that the class of card is most important when shooting movies -
    not something I do much of. I then read the instruction book for my new
    camera (1D mk IV) - the card class needs to be 6 or higher. So I cut open
    the plastic packaging (making the card non returnable), set the camera to
    highest resolution and fastest frame rate movie setting. I then shot an
    exciting movie of cars going past my house - the buffering indicator did not
    appear in the viewfinder. The card is fast enough to read data from the
    camera at the most demanding movie setting without the camera using it's
    buffer. It rankles slightly that I've not got the advertised card but as
    it's living in slot 2 as an overflow card it will no doubt do it's job.

    John
     
    eatmorepies, Aug 18, 2010
    #5
  6. Thanks again. Things have moved on. I sent a question to Sandisk, the
    A relief!
    Certainly not - if the card was faulty of did not meet the performance
    expectations, you could still return. How else does one test?
    Agreed. And if the camera needs Class 6, you are OK. Might be
    interesting to check prices and see just how much, if any, you were over
    charged. I usually get my cards from 7-day shop - I wonder how they
    compare with Amazon?

    Cheers,
    David
     
    David J Taylor, Aug 18, 2010
    #6
  7. eatmorepies

    DocGlock Guest

    Nope, mb is megabit
     
    DocGlock, Oct 1, 2010
    #7
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