Anyone have a Sandisk Extreme III card?

Discussion in 'Digital Photography' started by Guest, Feb 21, 2009.

  1. Guest

    Guest Guest

    I have a Sandisk Extreme III 8 GB SD card (the 30MB/sec edition), and
    I tried copying files from the hard drive to it and back, and timed
    the transfers. I copied 2 files - a 400 MB and 700 MB file (total of
    1.1 GB) - from the HD to the SD card, and it took 75 seconds, so
    that's a write speed of about 15 MB/sec for the SD card. Then I copied
    the files back to the HD and it took 90 seconds, so that's a read
    speed of about 12 MB/sec for the SD card. Doesn't seem to live up to
    its 30 MB/sec billing. I am using the SanDisk MobileMate SDDR-104 USB
    card reader, if that makes a difference. Is anyone able to get 30 MB/
    sec transfers with this card?
    Guest, Feb 21, 2009
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  2. Guest

    Guest Guest

    It is USB 2.0, according to Sandisk's web site. And USB 1.1 has a max
    speed of only 1.5 MB/sec.
    May I ask what type of card reader you are using? I suspect the
    MobileMate, although it is USB 2.0, doesn't support 30 MB/sec.
    I got mine from Adorama, who is an authorized Sandisk dealer, so I
    doubt it's a forgery.
    Guest, Feb 22, 2009
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  3. USB 2.0 means nothing - it needs to be "USB 2.0 hi-speed". USB 2.0 can
    still be "full-speed", but that's only 12Mb/s (1.5MB/s).

    The fastest I've seen off any USB 2.0 solid-state device I've tested is
    18.5MB/s, and that was a 4GB memory stick (and watch those memory sticks,
    some write a /lot/ slower than they can read. From a hard-disk I've seen
    a speed of 30MB/s (Seagate FreeAgent Go 320GB).

    Would a Firewire card reader be faster?

    David J Taylor, Feb 22, 2009
  4. Guest

    Guest Guest

    yes, assuming the card itself isn't the limiting factor. check rob
    galbraith's benchmarks.
    Guest, Feb 22, 2009
  5. Checking:

    It does look as if FireWire is faster. Pity he doesn't do SD reader tests
    either on FireWire or on the PC. I gave up CF cards years ago, and I'm a
    PC rather than a Mac user.

    David J Taylor, Feb 22, 2009
  6. Guest

    Guest Guest

    Guest, Feb 22, 2009
  7. Guest

    ASAAR Guest

    A number of cards were tested here for both read and write speed
    (and more) :,2143.html
    ASAAR, Feb 22, 2009
  8. David J Taylor, Feb 22, 2009
  9. I recently read an article on a german online magazine, , how
    a hard drive's free space, when formatted, does not exacltly match the
    advertised size. For example, my 320 GBHitachi deskstar sata 2 10400 rpm
    formatted is 298 GB (Win XP greek).
    Tzortzakakis Dimitrios, Feb 22, 2009
  10. Guest

    ASAAR Guest

    Hmm. I didn't check prices in the article, but I have a number of
    the Kingston and Transcend SDHC (2,4,8 and 16GB) cards and some of
    them appeared to be mentioned in the article. While I can't recall
    what I paid for most of these, they were all quite reasonably
    priced. I think J&R (local to me) had 4GB Kingston SDHC and 4GB
    SanDisk CF card for about $6, but I paid about $15 several months
    earlier for a slower 8 GB Class 2 SanDisk card because that was good
    enough for my mp3 player/jpg viewer.
    ASAAR, Feb 22, 2009
  11. Well, dahhhhh! Big surprise.

    Fist of all any file system has administrative overhead. Where do you
    suppose directories, free sector list, etc. are stored?

    And second there's the difference between decimal and binary "kilo",
    "mega", and "giga", the former based on 10^3 and used by HD
    manufacturers, the later based on 2^10 and commonly used in computer
    science. That difference is 2.4%.

    Jürgen Exner, Feb 22, 2009
  12. Good for keyboards and printers, but crap for volume.
    In the mean time FW800 is here, works, and at least for most Mac users,
    emminently available. eSata requires more stuff.
    John McWilliams, Feb 22, 2009
  13. 7.3% at the gigabyte level.

    1GB => 1073741824 bytes.

    David J Taylor, Feb 22, 2009
  14. Yes, this has been true since the beginning. A certain amount of
    headroom is needed for drivers, and secret sauce. .
    John McWilliams, Feb 22, 2009
  15. It was just the class of card - I normally buy SanDisk Ultra, and not the
    Extreme. Amongst the different manufacturers there is quite a speed
    difference, and the USB memory sticks (as opposed to cards) can be very
    slow writers.

    David J Taylor, Feb 22, 2009

  16. I have Windows systems here routinely handling 40GB/day 24 x 7 over USB
    2.0, so it's not that bad.

    I don't think anyone claims it provides the ultimate disk performance, but
    the 100-300GB 2.5-inch portable drives are very handy backup devices....

    David J Taylor, Feb 22, 2009
  17. "David J Taylor"
    True, you are right. I was thinking kB only.

    A long time ago in the good old days it was customary to use use lower
    case to denote decimal and upper case to denote binary. So 1kB would be
    1000 bytes and 1KB would be 1024 bytes.

    Jürgen Exner, Feb 22, 2009
  18. Guest

    D-Mac Guest

    No idea of the brand of reader I have. It's incorporated in a floppy
    drive and part of the PC. It is quite a lot faster than the "all in one"
    reader I used before upgrading. I believe it's about the fastest reader
    in the studio of 4 PCs although the MAC seems to be even faster and it
    too, has built a in reader.
    D-Mac, Feb 22, 2009
  19. Guest

    whisky-dave Guest

    Not forgetting the magic smoke, if you see that then the chances are
    somethings really
    fraked up ;-)
    whisky-dave, Feb 23, 2009
  20. Ron Hunter wrote:
    UNIX and its variant need swapfile space and metadata space as well, it's
    not just Windows. Things like System Restore on Windows can be turned
    off, if you must to save space.

    One other recommendation I would make is not to keep disks too full -
    perhaps something like 75% full - so that they can be defragmented more
    easily for best performance.

    At least disk storage space is cheap now - I hate to think how much I paid
    for my first hard disk in 1978 (?) - a top of the range 16MB or 20MB unit

    David J Taylor, Feb 23, 2009
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