Can an SD card stand to be constantly used, as if it were an SSD

Discussion in 'MacBook Air' started by wdaleherring, Jul 20, 2011.

  1. macrumors member

    Joined:
    Jul 19, 2011
    #1
    I will be getting a 13 MBA and actually didn't realize how much more it was for only double the storage. Anyway, I was thinking about ordering a 64GB SD card (for about $90 on Amazon) and just "permanently" sticking that in there to store my iTunes and such... do you think it could handle the constant use?
     
  2. macrumors 68020

    peskaa

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    Mar 13, 2008
    Location:
    London, UK
    #2
    Yes, it will handle it, but 1) the SD card will be sticking out the whole time and 2) SD cards aren't that fast, nowhere near as much as a true SSD (SanDisk do up to about 40MB/s)
     
  3. thread starter macrumors member

    Joined:
    Jul 19, 2011
    #3
    As long as it can perform as fast a an HDD I'll be good... (does it?) And damn, really? I've never messed with the Airs so I didn't know that it stuck out and didn't go flush. Hmmm....
     
  4. macrumors 6502

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    May 20, 2010
    #4
    Not even close to being flush unfortunately.
     
  5. macrumors 68000

    sparkie7

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    Oct 17, 2008
    #5
    Delkin do 80/90MB/s SDHC cards
     
  6. thread starter macrumors member

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    Jul 19, 2011
    #6
    What does the average HDD read/write at?

    HUGE bummer. Man... I really don't want to fork over $300 more for the 256...
     
  7. macrumors 68020

    peskaa

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    #7
     
  8. thread starter macrumors member

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    #8
    How do you think that would work with my AppleTV streaming from it?
     
  9. macrumors 68020

    peskaa

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    #9
    I'd hazard not too well, but depends on the content you're streaming. You'd be better off with a small external HD.
     
  10. macrumors 65816

    Joined:
    May 7, 2008
    #10
    Bigger SSDs last longer and perform better than smaller ones.

    On top of that SSDs tend to get slower as free space runs out.

    Might be worth it to get the 256GB.
     
  11. macrumors 6502

    Duke15

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    Canada
    #11
    Where did you see a 64gb SD card for 100$ wouldnt mind picking one up?
     
  12. macrumors 6502

    Joined:
    Jun 28, 2011
    #12
    A few issues with SD cards.


    -Reliability - Memory cards fail at a pretty high rate

    -Speed- Even a class 10 card will be slow if you have it almost filled up, no cache or anything on them.

    -Like others said, it will stick out



    Just get an external for much less money that will be faster and much more reliable.
     
  13. thread starter macrumors member

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    Jul 19, 2011
    #13

    Amazon, I didn't go looking for it, I just linked you to the search. Laziness at its best. :p
     
  14. thread starter macrumors member

    Joined:
    Jul 19, 2011
    #14
    Edit: Oops! Double post. Ban me now. :(

    Well this really sucks.

    I'm not too familiar with SSDs as I've never had a machine with one. So does this mean that if my drive (the MBA one) is 80% full, it will start running slower?
     
  15. macrumors 6502

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    Jun 28, 2011
    #15
    A little bit but not that much. TRIM support helps.
     
  16. macrumors 6502

    Duke15

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    #16
    Awesome thanks, hopefully its the same price in Canada
     
  17. macrumors newbie

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    May 19, 2012
    #17
    Speed test of SD card in MacBook Air

    My mid-2011 MacBook Air recognizes and uses a Komputerbay 64 GB SDXC card just fine. It's a $54 class 10 card from Amazon (http://www.amazon.com/gp/product/B008AN1DHI) and I formatted it Mac OS Extended (Journaled). However, I only get read speeds around 33 MB/s and write speeds around 15 MB/s from this card.
     
  18. macrumors newbie

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    Apr 22, 2008
    Location:
    Manchester, UK
    #18
    There was a recent Kickstarter campaign for this: http://theniftyminidrive.com

    They've not sent the rewards out yet so I'm not sure how well it actually performs but this would be a perfect solution for you when they actually ship.:)
     
  19. macrumors 6502

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    Jul 17, 2012
    #19
    SD cards are terribly unreliable. Make sure you have backups of whatever data you're doing this with.
     
  20. macrumors 68020

    Acorn

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    #20
    I tried this with a netbook I had and the speed was horrible. It was a class 10 card but it still was slower then molasses. never ever again will I waste my time with that.
     
  21. macrumors 6502a

    dcorban

    Joined:
    Oct 29, 2007
    #21
    I haven't found this to be true at all, and I have extensively used SD cards for years. However, I have always used Sandisk brand cards. I am well aware that many of the lower priced, off-brand cards have a high rate of data loss and almost never perform to their rated speed.

    To respond to the OP, an SD card will not be a good replacement for larger internal storage if you are truly accessing over 128GB of data on a frequent basis. Personally, I moved a few dozen GB of infrequently used documents and files to an SD card, allowing me to use the default 128GB drive and still have 40GB free space. This is with a 40GB music library, 15GB photo library, and 10GB of video.
     
  22. macrumors 6502

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    Apr 22, 2010
    Location:
    Michigan
    #22
    A typical 2.5 HDD will do 80-95 MB reads and writes (actual). At least thats what I see with my 2010 MBP 13 and 2011 MBP 15, both with 7500 RPM drives.

    ----------

    I don't TRIM is necessary as it once was.

    ----------

    You PROBABLY don't need blazing performance for iTunes if you are just playing movies and music. A fast SD should work fine for speed. I'd be more concerned reliability the physical aspects of this solution. I think that the solution should work fine.

    Be sure that you are using time machine and that the SD is included in the backups. As long you backup regularly you risk is pretty low.

    Give a shot, what do you have to lose. If it doesn't work, send the SD back. :)
     

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