Flash Memory - Limited write cycles

Discussion in 'MacBook Air' started by Mac Composer, Nov 9, 2010.

  1. Mac Composer macrumors member

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    Oct 29, 2010
    #1
    I keep hearing about this negative aspect of flash memory, a finite number of write cycles. So what is that number when it reaches the limit?
     
  2. Hellhammer Moderator

    Hellhammer

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    #2
  3. spinnerlys Guest

    spinnerlys

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  4. OptamusPriem macrumors newbie

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    Nov 2, 2010
    #4
    well with a little math you'll actually discover that 10k readcycles isnt 15TB but more like 1500TB
    if your SSD is 160GB (like my G2) then it would look something like

    (160 GigaBytes * 10.000 cycles) / 1000 = 1600 TeraByte

    15TB write wouldnt last many years, depending on usage.
     
  5. Hellhammer Moderator

    Hellhammer

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    #5
    That was writes, not reads. 15TB means that you would have to completely overwrite the 160GB version for ~94 times. That's a lot data, I doubt an average user ever reaches those numbers, especially for the boot drive (big files such as movies are usually stored in an ext HD anyway).

    If you're using it for professional purposes, e.g. as a scratch drive, then you may fill that number as you're writing GBs of data to it, daily.
     
  6. OptamusPriem, Nov 9, 2010
    Last edited: Nov 9, 2010

    OptamusPriem macrumors newbie

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    #6
    im sorry buddy, but it seems you dont understand the concept of a write cycle.
    also according to this article: http://techreport.com/articles.x/15433

    Intel estimates that the 80GB X25-M will last for five years with "much greater than" 100GB of write-erase per day.

    so if what youre saying is true, then intel would have done the math horrifyingly wrong as 100GB per day for 5 years is about 182TB,
     
  7. Merthyrboy macrumors 6502

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    Jul 21, 2008
    #7
    Wow I never knew flash memory had a limit to how much it could write. It is a high number probably have to be constantly moving movies around from hard disk to flash drive to manage that but still wow
     
  8. Hellhammer Moderator

    Hellhammer

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    #8
    My numbers are random writes, not sure does that change something.

    Anyhow, the limited amount of writes isn't an issue for most people. You can always get a new one if the old one runs out of writes. Besides, SSDs are still fairly young so their real world lifespan is still a big question mark
     
  9. Consultant macrumors G5

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    #9
    Do you know harddrive life is limited too. Nothing in the world live for ever. :rolleyes:

    Except naughty pictures on the internet.
     

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