Samsung Evo 850 2TB USB 3.0 Speed Normal?

Discussion in 'iMac' started by orangefridge, Oct 6, 2017.

  1. orangefridge macrumors newbie

    Joined:
    Mar 1, 2013
    #1
    Hi,
    After eventually talking myself out of putting my Samsung Evo 850 inside my laste 2015 i7 iMac, I purchased a USB 3.0 external enclosure (inatek) as many people recommended it would be optimum speed.

    I was under the impression I would be getting much faster Read / Write speeds than I'm getting.
    Am I missing something? Just formatted to Mac OS Extended (Journaled)

    Do I need to reformat it different? Firmware updates? (Can't find for this model)
    If this is my maximum speed I may as well stick to my Lacie.

    Thanks
     

    Attached Files:

  2. satinsilverem2 macrumors 6502a

    satinsilverem2

    Joined:
    Nov 12, 2013
    Location:
    Richmond, VA
    #2
    Thats pretty low im using a Satechi enclosure with that same drive and am getting 500/480 read/ writes so I would say that your enclosure is limiting you. what is the enclosure?
     
  3. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #4
  4. nikolajlr macrumors member

    Joined:
    May 11, 2011
    Location:
    Denmark
    #5
    Dug out some old tests I did back in 2014 - beware that the Disk Speed Test dials seem to have had another scale than the current version, so only look at the numbers.

    This is what I got on my iMac 27 2011 using a CalDigit Thunderbolt Station with USB3 with a Samsung 840 EVO 250 GB in a StarTech S2510BPU33 USB 3.0 chassis with UASP:
    DiskSpeedTest S2510BPU33 UASP.png
    With a Delock chassis without UASP, same SSD:

    DiskSpeedTest Delock 42475 no UASP.png

    And Thunderbolt 1: Samsung EVO 840 500 GB (note: it is by design faster than the 250 GB version above) in external Buffalo MiniStation Thunderbolt 1 chassis (came with HD I swapped out) and with TRIM enabled:
    DiskSpeedTest TB MiniStation 500 GB Samsung 840 EVO TRIM.png
    So it seems like you should be able to get better performance than you currently see.
     
  5. Fishrrman macrumors G3

    Joined:
    Feb 20, 2009
    #6
    I believe some speed is lost (via USB3) when "going through" an external dock (like the CalDigit, etc.)

    Connect the USB3 SSD -directly to- one of the Mac's USB3 ports, and test it again.

    I have a 2012 Mac Mini which I boot and run using SSD's mounted in external USB3 docking stations. I get reads of 431mbps from both drives.

    You should see 430mbps at least...
     

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