External SSD for OSX

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

  1. andreyush macrumors 6502


    Oct 24, 2015
    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


    Staff Member

    May 3, 2009
    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

    Mar 10, 2011
    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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