Will a new 2015 MBP run El Capitan?

Discussion in 'MacBook Pro' started by beansbaxter, Dec 14, 2016.

  1. beansbaxter macrumors member

    beansbaxter

    Joined:
    Jun 2, 2015
    Location:
    Seattle
    #1
    A few weeks ago, I purchased a Refurbished 2015 MBP from Apple, which arrived with Sierra installed on the machine.

    In the past, this laptop came with El Capitan. Is it possible to install El Capitan to an external drive to boot from on this laptop?
     
  2. gigapocket1 macrumors 65816

    Joined:
    Mar 15, 2009
  3. blairian89 macrumors 6502

    blairian89

    Joined:
    Dec 5, 2016
    Location:
    Texas
    #3
    I don't see why it wouldn't; give it a shot! Worst case you can re-install Sierra through the recovery partition.
     
  4. beansbaxter thread starter macrumors member

    beansbaxter

    Joined:
    Jun 2, 2015
    Location:
    Seattle
    #4
    Well, it worked - Mavericks caused a kernel panic, and El Capitan worked great. Installed El Capitan onto an old USB 3 drive, and it was slow...

    I plan on leaving Sierra installed on this laptop, and would like to run El Capitan from an external drive. In this scenario, what would be faster - a USB 3 Flash Drive or a Thunderbolt SSD Drive?
     
  5. henrikbjorn macrumors newbie

    henrikbjorn

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    Jul 13, 2015
    #5
    Thundebolt 3 drive as it have a better bandwidth
     
  6. chabig macrumors 68040

    Joined:
    Sep 6, 2002
    #6
    An SSD is always faster than a flash drive, as well.
     
  7. henrikbjorn macrumors newbie

    henrikbjorn

    Joined:
    Jul 13, 2015
    #7
    I am curious, why do you want El Capitan and not Sierra?
     
  8. beansbaxter thread starter macrumors member

    beansbaxter

    Joined:
    Jun 2, 2015
    Location:
    Seattle
    #8
    Hmm

    I ordered a very fast 64GB USB 3 stick to try.

    Is there an external SSD using Thunderbolt that's recommended?
    --- Post Merged, Dec 15, 2016 ---
    There is an app I need to run - works in El Capitan and has been deprecated for Sierra. I'm fine leaving Sierra on the laptop, and running El Capitan on an external drive for occasional use.
     
  9. zone23 macrumors 68000

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    May 10, 2012
  10. Fishrrman macrumors G4

    Fishrrman

    Joined:
    Feb 20, 2009
    #10
    My new (purchased 2 weeks ago) 2015 MacBook Pro 13" came with El Capitan pre-installed.

    Runs fine.

    Not interested in Sierra yet.
     
  11. ubercool macrumors 6502a

    ubercool

    Joined:
    Jan 31, 2008
    Location:
    Las Vegas
    #11
    There are very few USB 3.1 Gen 2 hard drives and even fewer Thunderbolt 3 drives, here's my short list with comments:

    • LaCie 2TB Bolt3 $1999 [this will be the ultimate Thunderbolt 3 drive, two SSDs striped; 2800Mbs throughput]
    • SandDisk 1.9TB Extreme 900 $750 [this is the only USB 3.1 Gen 2 interfaced external SSD]
    • Samsung 1TB T3 $350 [if you want Samsung and you can't wait for their SSD announcements at CES, particularly an update to the T3 external SSD — the current one is USB 3.1 Gen 1, unfortunately]
    • Seagate 8TB Innov8 $320 [the biggest USB-C USB 3.1 Gen 2 drive out there, NO POWER BRICK]
    • CalDigit 2TB Tuff $179 [this is a regular hard drive but it's one of the few with a USB 3.1 Gen 2 interface]

    As you can see, the list is incredibly short. Most manufacturers have yet to convert their lines to USB 3.1 Gen 2. And the situation is even worse on the Thunderbolt 3 side, where you can count drives and enclosures with one hand.
     
  12. beansbaxter thread starter macrumors member

    beansbaxter

    Joined:
    Jun 2, 2015
    Location:
    Seattle
    #12
    To bring conclusion to this thread, and to help out others who may be in similar situations...

    The old USB 3 drive I tested everything out on was a 32GB Corsair Flash Voyager Slider (USB 3.0) and it was painstakingly slow. I ordered a 64GB SanDisk Extreme CZ80 (USB 3.0) and it was lightning fast! Incredibly fast!

    Straightforward and easy process: Formatted the SanDisk for a Mac, mounted it with a partition table, downloaded and installed El Capitan to it, and it worked great. And while I haven't run any benchmarks, booting and running programs off this SanDisk feels nearly as fast as the internal SSD in the MBP.

    Had the SanDisk been too slow, I was prepared to purchase an external SSD over Thunderbolt, but this works out much better. The SanDisk is very portable, and 64GB was more than enough. And now I can boot El Capitan the few times I'll need it, and continue running Sierra 99% of the time on my MBP.
     

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