It must be better if you can format the external hard drive beforehand to make it compatible with your Mac. For better performance, it is recommended that it be an SSD. Since Apple only requires you to have a little over 8 GB of free space, any hard drive, even one with 128 GB, will do just fine. However, to begin with, this, you will need an external hard drive. It will even let you use the same hard drive with multiple Macs, without updating to Sierra on each of those.

There is no doubt about the fact that you will save a lot of trouble and hassle if you install the macOS Sierra on an external drive. You can simply go ahead and install the macOS Sierra on an external hard drive, and then boot your Mac from that! The Prerequisites However, there is a solution to all of that. For those who have a lot of data on their Macs, this can be a very lengthy procedure. You also have to back up the entire system before installing macOS Sierra, which is a must-do step in any update. In addition to that, if you are using an older Mac, then you will still face a few issues while running Sierra. While that is the minimum recommended by Apple, you will probably need a bit more to make use of it. However, even if your Mac does support Sierra, there may be a few reasons as to why you may not be able to install it on your hard disk.įor starters, it takes around 8GB of storage space. If you have a Mac, then you probably cannot wait to get your hands on the Sierra - provided your system supports it. The macOS Sierra is a wonderful operating system - and easily the best for all Apple computers and laptops.

Install high sierra on external drive