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

rekhyt · Dec 12, 2012, 07:56 PM

Is the flash memory faulty in my MacBook Air (2011)? I can only reach up to 20-30MB/s write.

Amad3U5 · Dec 13, 2012, 01:35 PM

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.

rekhyt · Dec 13, 2012, 03:17 PM

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?

Dec 12, 2012, 07:56 PM	#1
rekhyt macrumors 6502a Join Date: Jun 2008	Is the flash memory faulty in my MacBook Air (2011)? Is the flash memory faulty in my MacBook Air (2011)? I can only reach up to 20-30MB/s write. __________________ iPhone 4 (8GB) // iPad 3rd gen // MacBook Air 11" ('11) // Magic Mouse
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Dec 13, 2012, 01:35 PM	#2
Amad3U5 macrumors member Join Date: Nov 2012 Location: Sydney	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. __________________  27" Sandy Bridge iMac; 13" 2012 MacBook Air; iPhone 5  ______________________________________________________________ In a world of without walls and fences, who needs Windows and Gates?
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Dec 13, 2012, 03:17 PM	#3
rekhyt Thread Starter macrumors 6502a Join Date: Jun 2008	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? __________________ iPhone 4 (8GB) // iPad 3rd gen // MacBook Air 11" ('11) // Magic Mouse
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