Late 2011 MBP 2.8 i7 Slow SSD Write Speeds

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

  1. csd15 macrumors newbie

    Jan 10, 2017
    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 68000


    Jan 19, 2015
    Oregon, USA
    I would suspect a degrading SATA cable in your older MBP.
  3. jerryk macrumors 68030

    Nov 3, 2011
    SF Bay Area
    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

    Jan 10, 2017
    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

    Jan 10, 2017
    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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