External SSD for OSX

Discussion in 'iMac' started by andreyush, Nov 13, 2016.

  1. andreyush macrumors 6502

    andreyush

    Joined:
    Oct 24, 2015
    #1
    Hello. It is possible to buy an external SSD (USB-C to usb3.0 A) for iMac and to install and boot osx on it ?

    What are the differences of performance between the internal and external SSD?
     
  2. maflynn Moderator

    maflynn

    Staff Member

    Joined:
    May 3, 2009
    Location:
    Boston
    #2
    I run my iMac off an external SSD, and its plenty fast. I've been very happy with the performance.
     
  3. Taz Mangus macrumors 68040

    Taz Mangus

    Joined:
    Mar 10, 2011
    #3
    You can use an external SSD drive to boot OS X from. Depending on the model year of the iMac the speed difference between internal and external SSD can be pretty dramatic. The late 2015 iMac SSD speed is about 1500MB/s for the internal vs. ~500 MB/s for an external SSD in a USB 3 enclosure. Something to consider when using SSD in a USB3 enclosure, TRIM will not work.
     

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