What's a Vertex 4 M SSD?

Discussion in 'Mac Pro' started by lloyd709, Sep 4, 2012.

  1. lloyd709 macrumors 6502

    Joined:
    Jan 10, 2008
    #1
    Dabs in the UK have started to list a Vertex 4 M 512 Gig at £329 next to their Vertex 4 512 Gg which is £439!!

    Can't find any reviews of a Vertex 4 M!!!
     
  2. lloyd709 thread starter macrumors 6502

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    Jan 10, 2008
    #2
  3. throAU macrumors 601

    throAU

    Joined:
    Feb 13, 2012
    Location:
    Perth, Western Australia
    #3
    The more expensive one likely has "enterprise class" NAND in it, and possibly other enterprise features such as a capacitor to ensure writes complete properly if power is lost, etc.

    NAND flash wears out (Unfortunately unlike with a spinning disk there is very little warning - no clicks, etc of impending failure). Enterprise drives are good for more re-writes before failure.


    That's my guess in any case - most flash vendors provide "consumer" and "enterprise" class drives in this way.
     
  4. DanielCoffey macrumors 65816

    DanielCoffey

    Joined:
    Nov 15, 2010
    Location:
    Edinburgh, UK
    #4
    And that is why good SSD makers have routines in the Firmware that will detect the impending cell failures and use the reserved cells instead, marking the "soon to be bad" cells as not to be trusted.
     
  5. throAU macrumors 601

    throAU

    Joined:
    Feb 13, 2012
    Location:
    Perth, Western Australia
    #5
    Yes. Which is all well and good and normal until you run out of the spare cells - the drive doesn't let you know when it starts consuming the spares, or if they are running low.

    And then they fail with no warning. Enterprise SSDs have more spare cells, too. You need to make sure you're on top of your backups.
     

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