Rev B Air Question: How much does nearly full SSD impair performance/trigger fan?

Discussion in 'MacBook Air' started by ghileman, Jan 13, 2011.

  1. macrumors regular

    Joined:
    Feb 4, 2008
    #1
    I've got a 2+ year old Rev B with 128GB SSD with only 4GB of space left.

    Fan comes on a lot and stays on, even when vents aren't blocked and when not watching video.

    Can't say for sure but it seems like snappiness has dropped a bit too as I've started to run out of SSD space.

    Thanks.
     
  2. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
    Having that little free space will definitely impact the performance. I suggest you to read this, it explains SSD degradation in layman terms. I would try to have at least 10GB of free space, preferably more.
     
  3. macrumors 6502

    Joined:
    Jan 7, 2009
    Location:
    Brooklyn
    #3
    Good article Hellhammer.

    I recently bought a OWC 60GB SSD for my MBP. I was under the impression the OWC SDDs don't have this problem? Am I correct and why? Or is it just marketing?

    Based on the article, would it be advisable to every so often clone your SSD to another drive, format the SSD, and then clone it back? Wouldn't that "reset" the issue with the degradation?
     
  4. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #4
    OWC SSDs, just like all SandForce based SSDs have built-in TRIM which means the actual block will be erased instead of just left there. I suggest you to read this as it again, explains TRIM in layman terms. OWC drives also ship with quite a lot extra space which is for garbage collection so that helps too.

    What I've seen, OWC drives don't suffer from degradation so you don't have to do anything. Of course, it's still advised to have some free space there so it will operate smoother.
     
  5. macrumors G3

    Kilamite

    Joined:
    Mar 20, 2007
    Location:
    Scotland
    #5
    No, because it'll fill all the pages in a block, because they are fully writable again. Rather than being in a state where they are there, but allowed to be overwritten. If that makes sense.. I know what I'm trying to say!
     
  6. Moderator emeritus

    Hellhammer

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #6
    There are tools which will perform a "secure erase" which will clear all blocks. Basically that should make the drive like new. However, like I said, that is not needed with SSDs like OWC
     
  7. macrumors 6502

    Joined:
    Jan 7, 2009
    Location:
    Brooklyn
    #7
    I've reached the limit in my understanding but thanks for that additional article and relieving my concern since I bought an OWC SSD. It sounds like TRIM ought to be the only way to go with SSDs. The article did mention there are still issues with rewrites (files that aren't deleted first) but I'm assuming it's not that big an issue. Just glad I went with the OWC one (as I've heard suggested here before).

    I would be interested in hearing Kilamite's explanation again as to why cloning it back onto a formated SSD wouldn't work. Are you saying all that would do is clone it back with the exact same problem? Then again, sounds like I don't have to worry about it.

    thanks
     
  8. thread starter macrumors regular

    Joined:
    Feb 4, 2008
    #8
    thank you for the responses
     

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