Are SD cards capable of being as fast as usb flash drives?

Discussion in 'OT Technology' started by cleankutazn, Feb 14, 2008.

  1. cleankutazn

    cleankutazn New Member

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    I have a corsair 8gb flash voyager and wanted an SD card that can compete with it.
     
  2. P07r0457

    P07r0457 New Member

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    if you get one of the faster sd cards, yes.. they are quite quick.
     
  3. deusexaethera

    deusexaethera OT Supporter

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    SD cards are faster than USB. Pretty much every kind of memory card is faster than USB. That's why they don't use USB drives in cameras.

    I have a SanDisk Extreme III card (with ESP!) that I'm quite fond of. It runs at 133x -- whatever the hell an "x" is for an SD card.
     
  4. P07r0457

    P07r0457 New Member

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    NOT true. I see you're talking out your ass, again.

    A "usb drive" is just flash memory and a bridge. Same as a SD card is just flash memory.

    Rating Speed (MB/s)
    6x 0.9
    40x 6.0
    66x 10.0
    133x 20.0

    So a standard card is a 40x, which gives 6MB/sec which is equal to 48Mbps...

    USB 2.0 is 480Mbps theoretical...

    This is why high performance SD cards are becoming very common.

    A 133x card is 20MB/sec which is 160Mbps.... still short of USB 2.0 speeds.
     
  5. deusexaethera

    deusexaethera OT Supporter

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    Christ almighty, I was talking about USB drives, not USB ports. The bridge controller on a USB drive slows it down, and like you said, SD cards don't have that bridge controller.
     
  6. P07r0457

    P07r0457 New Member

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    in order to be useful, an SD card must be inserted into a card reader. The bridge is in the card reader.
     
  7. deusexaethera

    deusexaethera OT Supporter

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    When you plug it into a computer, yes. When you plug it into a camera, no. The camera interfaces directly with the FLASH.
     
  8. P07r0457

    P07r0457 New Member

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    a 133x card is 20MB/sec which is 160Mbps.... still slower than USB... Even at "max theoretical" speed of the SD card.
     
  9. deusexaethera

    deusexaethera OT Supporter

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    160Mb/s is slower than USB 2.0 spec, but is it slower than the max throughput of the bridge controller on the OP's USB drive? Let's ask him to do a transfer benchmark or something, if we really want to get a useful answer.
     
  10. cleankutazn

    cleankutazn New Member

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    I only get 20MB read and Write on my corsair flash voyager....I haven't been able to buy a fast SD card yet...I was thinking of getting compact flash, it has 300x speeds :hsd:
     
  11. deusexaethera

    deusexaethera OT Supporter

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    compactflash is nice, but SD is more popular nowadays, not least because the slots are smaller. Gotta keep in mind that it's useless if you can't plug it in.

    (that said, I backup my stuff on a Microdrive)
     
  12. cleankutazn

    cleankutazn New Member

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    Are the kaser 30gb microdrives any faster than my corsair voyager?
     
  13. deusexaethera

    deusexaethera OT Supporter

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    I don't know. I have Hitachi 6GB microdrives, which are not as fast as most compactflash, but have an unlimited lifetime.
     
  14. cleankutazn

    cleankutazn New Member

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    I'm testing how long mine will last by using it to d/l bitorrent files everyday and constantly erasing it and transferring files to my HD.
     
  15. deusexaethera

    deusexaethera OT Supporter

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    Make sure to defrag it after every use, too. ;)
     
  16. P07r0457

    P07r0457 New Member

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    not really. Compact Flash is still VERY popular for DSLR... And card readers arn't going anywhere.
     
  17. cleankutazn

    cleankutazn New Member

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    :rofl:..I don't wanna kill it that fast
     
  18. deusexaethera

    deusexaethera OT Supporter

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    I was thinking more along the lines of point/shoot pocket cameras and the users who love them.

    As you're well aware, some casual users have had issues using card readers effectively in the past. ;)
     
  19. P07r0457

    P07r0457 New Member

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    the same users that dislike card readers are likely not to desire a card for the same purposes as the OP. :squint:
     
  20. deusexaethera

    deusexaethera OT Supporter

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    Unless they have a digital camera. :fawk:
     
  21. P07r0457

    P07r0457 New Member

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    no, because that type of users doesn't care about the card.... it gets inserted into the camera and is left there. As far as they know/care there is no card, and the camera might as well have built-in memory.
     

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