SD Card Question

Discussion in 'MacBook Pro' started by Benjamin,, Jul 6, 2012.

  1. Benjamin, macrumors member

    Benjamin,

    Joined:
    Jun 13, 2012
    Location:
    Brighton, UK
    #1
    Booting off a SD card and placing my apps and programs on one.
    What do I need to know?

    I want to keep the SuperDrive, as I use that often enough to require one right now, in the future I might remove it and place a SDD in it's place. What is the speed difference between a SD card and SDD?

    Also what time of SD card should I get. I want something that is fast but also cheap. But I really do want quality rather than price, so something that is quite nippy.
    I'm looking in the 128GB range.

    Thanks!
     
  2. gentlefury macrumors 68030

    Joined:
    Jul 21, 2011
    Location:
    Los Angeles, CA
    #2
    You will need a very high speed SD card to use it with any efficiency. As far as I know, the highest speed is about 30MB/s, which is quite slow compared to even a 5200rpm drive. So booting an OS off of that will be very cumbersome and running apps will be pretty unstable.
     
  3. Benjamin, thread starter macrumors member

    Benjamin,

    Joined:
    Jun 13, 2012
    Location:
    Brighton, UK
  4. mohsy90 macrumors 65816

    mohsy90

    Joined:
    Feb 4, 2011
    Location:
    New York
    #4
    off an SD card??? by SD you mean SanDisk right?

    They are no where near as fast as an SSD ( you wrote SDD) and you are going to a pay premium price ($150+) for a descent 128GB SD card.

    Not sure exactly what you are doing, but you might as well use that money to buy a 256Gb SSD that you can use as the main hard drive.
     
  5. gentlefury macrumors 68030

    Joined:
    Jul 21, 2011
    Location:
    Los Angeles, CA
    #5
    ^^ Yes
     
  6. Benjamin, thread starter macrumors member

    Benjamin,

    Joined:
    Jun 13, 2012
    Location:
    Brighton, UK
    #6
    I don't have that sort of cash to splash though, but ok!
     
  7. heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #7
    are you talking about SD cards? like the ones found in most digital cameras? those things would be way to slow to use to boot OS and apps off
     
  8. mohsy90 macrumors 65816

    mohsy90

    Joined:
    Feb 4, 2011
    Location:
    New York
    #8
    Why do you want to boot applications off of a SD card??

    What's wrong with your main hard drive?

    A SD card as a read/write speed of 30-45 Mb/s whereas SSDs have read/write speeds of 400+ Mb/s.

    I don't see the logic behind what you are trying to do.
     
  9. blueroom macrumors 603

    blueroom

    Joined:
    Feb 15, 2009
    Location:
    Toronto, Canada
    #9
    SDHC uses a fairly slow 4bit SPI type interface. A FireWire 800 drive is workable as a boot drive.
    An internal SSD is many times faster than either, another option is a Hybrid drive like a Mometus XT
     
  10. Benjamin, thread starter macrumors member

    Benjamin,

    Joined:
    Jun 13, 2012
    Location:
    Brighton, UK
    #10
    I just thought a SD card would be a similar speed to that of a SSD.
    I can easily manage off a HDD, and will. Thanks! :)
     
  11. mohsy90 macrumors 65816

    mohsy90

    Joined:
    Feb 4, 2011
    Location:
    New York
    #11
    yeah, you were very misinformed.
     
  12. Benjamin, thread starter macrumors member

    Benjamin,

    Joined:
    Jun 13, 2012
    Location:
    Brighton, UK
    #12
    Someone else on these forums said s/he booted off a SD card and it was faster than a HDD. All lies...
     

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