Late 2011 MBP 2.8 i7 Slow SSD Write Speeds

Discussion in 'MacBook Pro' started by csd15, Jan 11, 2017.

  1. csd15 macrumors newbie

    Joined:
    Jan 10, 2017
    #1
    So I popped in a new SSD in my MBP, a Transcend 480GB SSD (it had great reviews), but I'm getting terribly low write speeds - I'm using the Blackmagic Speed Test app to do the benchmarking. I'm getting around 37mb/s write speed on average which doesn't seem right, especially given that I am getting around 500 mb/s for read speed. Additionally, I know I have a SATA III connection given that the link and negotiated link speed for the drive is 6 gbs.

    Any ideas why I would have these issues?
     
  2. CoastalOR macrumors 68020

    CoastalOR

    Joined:
    Jan 19, 2015
    Location:
    Oregon, USA
    #2
    I would suspect a degrading SATA cable in your older MBP.
     
  3. jerryk macrumors 68040

    Joined:
    Nov 3, 2011
    Location:
    SF Bay Area
    #3
    How full is the disk. SSD can get slow as the free space gets low. I try to maintain 10-20% free.

    And CostalOR is right about the SATA cable. They degrade/fail as they age or get touched.
     
  4. csd15 thread starter macrumors newbie

    Joined:
    Jan 10, 2017
    #4
    Fresh SSD and clean install of El Capitan. I guess I'll be ordering a new cable then! Thanks to you both.
     
  5. csd15 thread starter macrumors newbie

    Joined:
    Jan 10, 2017
    #5
    Did another disk speed check today after my hard drive was done being encrypted...200-400 mb/s now! I guess I should have known...
     

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