How does one install Mac OS X 10.11 on an EXTERNAL DRIVE
HELP - I’m going crazy! How does one install Mac OS X 10.11 on an EXTERNAL DRIVE (in this instance, a SanDisc Extreme PRO Portable SSD) hereafter referred to “external drive”. #1 - I formatted and created three partitions on the external drive (Mac OS Extended (Journal) and made sure GUID was selected in the formatting and partitioning process. #2 - I downloaded (from Apple) OS X El Capitan to my primary HD on my iMac (Mid-2015). I double-clicked the downloaded file to open the file within named InstallMacOSX.pkg which then displayed: "This package will run a program to determine if the software can be installed". #3 - I clicked “Continue” and then got the following message: "OS X v10.11.6 is already installed on this computer. Use the Updates page to install the 10.11 update or if you would like to download the full OS X installer click Continue".
This is where everything turns sour……….or frankly RIDICULOUS! The installer will not allow me to install this OS on a volume on the external drive because: “OS X can’t be installed in this disk. OS X isn’t installed". I KNOW IT ISN’T INSTALLED (on the external drive) because THIS IS WHAT I AM TRYING TO DO……….INSTALL IT ON THE EXTERNAL DRIVE!!!!
What am I missing here? Rather than describe some alternative thoughts I have, I am going to see of any of you kind and knowledgeable people out there can tell me exactly what I need to do to get the Mac OS X El Capitan installed on a volume on the EXTERNAL DRIVE. (Btw - I have 32.01 GB of space allocated on the volume to which I am trying to install this Mac OS.) Would greatly appreciate some expert advice………..