The method described in this tutorial works to install a bootable OS X Yosemite instance onto any external disk, whether it’s a USB flash drive, a generic external hard drive, or whatever other external volume you have. The last point is important, because the experience very well be much slower than what you’re used to. First up is making the external disk not a bootable volume, this is done through Disk Utility. Now you’re ready to install OS X Yosemite onto the newly made bootable external disk. Installing onto an external drive may take a while, depending on the speed of the destination disk.
The installation needs to complete in order to function properly, if you stop it early the Yosemite install will not be completed and will not run.
Is a 1TB Western Digital “My Passport” External drive known to be incompatible with this procedure? I have used the drive for file storage, for some months, but reformatted it just now to use as a Yosemite-test drive. Do you need the Developer Preview version or is it ok to use the OS X Beta program version? You should boot in to the Yosemite installer, then go back to the previous step where you select the langue. When I installed Yosemite on my external drive, it seems to have done something to my main (internal) drive.

I was able to resolve the issue by reinstalling Mavericks from the Recovery-10.9 partition.
It’s a bit slow, as warned in the article, but tolerable for testing purposes and works fine. Should i be able to migrate like that, or is the partition i made on the ssd already registering a user?
I also notice that I select startup disk and then quit startup disk, a select languages appear on the top left but if I click it … does nothing. The answer is yes, you can install Yosemite onto an external disk, and yes it will be bootable, we’ll show you exactly how to do that. Again, this is dependent on the speed of the external drive that Yosemite is being installed onto. The external drive will be formatted for this purpose, meaning it will be completely erased and all data on it will be lost. We assume you already have the OS X Yosemite downloaded and ready to go, if not you can get it from the Mac App Store through the Mac Dev Center. Speaking of speed, it’s hard to overstate that performance of Yosemite (or OS X, or any other OS for that matter) running off an external volume is often considerably slower than running off an internal volume, and hardly representative of the true native experience of running on an full speed drive. While performance is sufficient to get a feel of the general changes and appearance, the overall experience is tremendously slow when compared to running OS X Yosemite directly off of an internal SSD. Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox!

I connected an external Firewire drive, formatted it as instructed, and running the Yosemite installer from within Mavericks, I was able to install Yosemite on the external drive. The odd thing is, however, that when I boot into Yosemite from the external drive, I can see that my Mavericks drive looks OK. If you use a slow external flash drive or old external hard disk, don’t be surprised if you encounter many beachballs, making this a very suboptimal experience and by no means representative of Yosemite performance in general.
Performance ultimately depends largely on the speed and connection of the external drive being used, but something like an USB 2.0 external drive is undoubtedly much slower than whatever drive is built internally into the Mac. I would definately recommend doing it through a Thunderbolt or FireWire drive, not a USB drive.
On the other hand, a fast Thunderbolt or USB 3.0 drive may perform quite well for testing purposes. At this early stage, it’s a bit rough around the edges, but Apple will polish it up over the Summer.

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  1. 02.04.2016 at 21:50:50

    Also use the cloud than it has opened, PUP.Optional.JustCloud.A installs itself.

    Author: baby_girl
  2. 02.04.2016 at 15:50:28

    Gives free space provides improved security from instead.

    Author: NoMaster