Activating SATA 2 on a Samsung EVO SSD

Discussion in 'MacBook' started by Big Ron, Jul 6, 2014.

  1. Big Ron macrumors 6502

    Big Ron

    Joined:
    Dec 7, 2012
    Location:
    United Kingdom
    #1
    Hi all

    After reading several threads on the subject I seem unable to settle on the definitive answer:

    I have just updated my white unibody MacBook with a Samsung EVO 840 250Gbyte SSD. It all went well and on the whole I'm well impressed.

    Running BlackMagic speed test informs me that I am averaging:
    write 209 Mbytes/s and read: 264Mbyte/sec.

    My question is could I do any better? Is there an Terminal command I could try to force SATA 2? I understand I will never reach SATA 3 speeds.:confused:

    Any help would be greatly appreciated:D
     
  2. chrfr macrumors 603

    Joined:
    Jul 11, 2009
    #2
    Your Macbook already runs at SATA 2 speeds. There's nothing to change.
     
  3. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #3
    S-ATA 1.5 Gbps (S-ATA I) offers around 150 MB/s read and write speed, S-ATA 3.0 Gbps (S-ATA II) offers almost double of that.
    Your stated speeds are within those limits and your SSD performs fine.
     
  4. XoFu macrumors regular

    XoFu

    Joined:
    Apr 8, 2013
    #4
    In my case I did nothing and the negotiated speed of the evo is 3Gigabit, i.e. SATA II speed.

    I think this is the best you can achieve, which is really good!

    Good luck
    X
     

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  5. Big Ron, Jul 6, 2014
    Last edited: Jul 6, 2014

    Big Ron thread starter macrumors 6502

    Big Ron

    Joined:
    Dec 7, 2012
    Location:
    United Kingdom
    #5
    Thanks XoFu, simsaladimbamba and chrfr for your speedy replies.

    Its nice to know all is well, iv'e said it before but this Forum is the best for advice and guidance:)

    Once again thanks
     
  6. brdeveloper macrumors 68020

    brdeveloper

    Joined:
    Apr 21, 2010
    Location:
    Brasil
    #6
    That's about what I get on my Crucial M500 and a also with a 840 EVO under SATA II. Your SSD seems to be operating at SATA II as expected.
     
  7. Big Ron thread starter macrumors 6502

    Big Ron

    Joined:
    Dec 7, 2012
    Location:
    United Kingdom
  8. Altemose macrumors G3

    Altemose

    Joined:
    Mar 26, 2013
    Location:
    Elkton, Maryland
    #8
    Just something to know, the speed of a drive is negotiated by the chipset it is plugged into. For instance, a USB 2.0 flash drive on a USB 1.1 chipset is going to run at USB 1.1 speeds. There is no hardware to change aside from jumpers on 3.5" drives which can force the drive to be limited to a certain speed. This is hardly necessary in modern computers, and I only had to ever do it in my PowerMac G5.
     

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