SSD Wear Leveling and Partitions

Discussion in 'macOS Sierra (10.12)' started by now i see it, Mar 2, 2017.

  1. now i see it macrumors 68040

    Jan 2, 2002
    If an SSD was partitioned in two, with a different bootable OS on each partition, will the SSD wear level on the entire drive if only always booted on the same partition, or will wear leveling be confined to only that booted partition?

    This isn't a Sierra question per se, but a Mac partition & SSD function question I guess.
  2. keysofanxiety macrumors G3


    Nov 23, 2011
    I wouldn't worry. Modern SSDs can withstand a solid 50GBs worth of data written daily for 5 years straight without failing.

    That's not to say SSDs don't fail, of course. But if they do, it's most likely due to something else.

    Basically, don't worry! Just use your computer as you would expect to. Make backups of the stuff you can't afford to lose, naturally. But no need for concern. :)
  3. Tech198 macrumors G5

    Mar 21, 2011
    Australia, Perth
    SSD's write to any part of the drive.... just like spinning hard drives, do,, Its only the OS that cares about the partition being used..
  4. Johnny7128 macrumors newbie


    Mar 2, 2017
    The wear levelling algo works on the whole drive regardless of partitions or how you set it up.
  5. argon3030 macrumors newbie

    Nov 13, 2016
    United States of America
    Yes, regular backups are a must, no matter what. But 50 GB per day is not as much as it sounds, particularly if you leave the computer running 24/7. Some recent studies showed Firefox and Chrome can write 20+ GB per day on their own, even with only casual light web browsing. It's unfortunate that most consumer SSD's are rated for such low write durability.

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4 March 2, 2017