Chosen Solution
I have installed a Kingston SSD following the guide on this website, I have formatted it from the systems HD OS X boot partition as GUID Extended. I would now like to install OS-X El Capitan on it. The drive is visible when the computer is turned ON from OFF in disk utility/desktop, but if the computer is restarted, the drive is not visible. So its impossible to make it an OS X Boot drive and I’m not sure I want to anyway with it behaving so strangely. Any bright ideas? Update (07/06/2016) I ran the OS-X installer from HD partition, specifying the SSD as install directory. It restarted, it then asked which drive I would like to install to, with only the current HD visible, as i expected. Then I shut down, turned it on again, and it now picked up with the SSD installation as it should have, as I suppose it was now visible. So, some progress, but i expect weird behaviour with restarts in the future, So any ideas very appreciated. Thanks! UPDATE: OS X works on new SSD, boots nicely, However…. Restarting causes it to boot into the old OS-X installation on HD. I need to shut down entirely to boot into SSD OS.
Installing the OS can be a bit confusing! The reason you saw the SSD drive disappear was the system needed to prep the drive within Disk Utility or the OS Installer app. Anytime the lowest structure of the drive is being altered the Disk Utility as well as the OS Installer app needs to remove it from the Desktop. This is normal! It sounds like you got the drive setup now, all you need to do here is get the SSD to become the boot up drive. With the systems running (it makes no difference which drive it booted up from) go into your Systems Preferences there you will find a control panel called Startup Disk. Open it up unlock it and then alter the selection to the drive you want as the boot drive. That should do it as an alternate method you can always leverage the Boot Manager service by holding the Option key this is useful when you need to do some repairs to the current boot drive as Disk Utility won’t allow you to run repair option if the drive you are repairing was the boot drive.
