Is the flash memory faulty in my MacBook Air (2011)?

Discussion in 'MacBook Air' started by rekhyt, Dec 12, 2012.

  1. macrumors 65816

    Joined:
    Jun 20, 2008
    Location:
    Part of the old MR guard.
    #1
    Is the flash memory faulty in my MacBook Air (2011)? I can only reach up to 20-30MB/s write.
     
  2. macrumors member

    Joined:
    Nov 17, 2012
    Location:
    Sydney
    #2
    Yes, definitely. Mine gets 450 MB/s write and 590 MB/s read. Before taking it back in to the Apple Store, make sure that these measurements you are using are trustworthy. Instead of downloading software to benchmark you're SSD, you can just enter these commands into Terminal:

    For read speed:
    dd if=tstfile bs=1024k of=/dev/null count=1024

    For write speed:
    time dd if=/dev/zero bs=1024k of=tstfile count=1024

    Note that the results will be in bytes/s, so you'll have to convert it (just google: "convert <speed> to MB/s".)

    If you still come up with 20-30 MB/s, then you should take it in to a store.
     
  3. thread starter macrumors 65816

    Joined:
    Jun 20, 2008
    Location:
    Part of the old MR guard.
    #3
    Thanks for the terminal commands.

    Got read 167 (mb/s) and write 133. Really wish they'd show the exact speed at which it copies, but knowing Apple, they'd just show a progress bar and the time remaining.

    Are my numbers normal?
     

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