Below I assume the bigger volume on the external drive has the name "Sierra".Įxample: if your external drive has a size of 1 TB, then the first partition "Sierra" should have a size of 988 GB and the second "Sierra_Installer" partition one of ~12 GB. The partition scheme has to be GUID! If your MacBook's main partition already has the name "Sierra" choose another name for the first partition of the external drive. ![]() ![]() Assuming that you don't have an additional thumb drive (according to Apple with at least 12 GB - I got it to work with a 8 GB thumb drive) I recommend the following method:Įrase and repartition your WD easystore to two Mac OS Extended (Journaled) partitions - a bigger one first with the name "Sierra" and the size (total_size_of_external_drive - 12 GB) and a much smaller second one with the name "Sierra_Installer" and a size of ~12 GB.
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