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Hey there,
So I recently bought a Samsung T5 1TB external SSD and wanted to use it as a start up disk for a new version of Mojave (I have an iMac 21.5 Late 2015). I followed the steps given by the many tutorials on youtube (Erase, partition, etc) but it is still not showing up as start up disk option. PLEASE HELP! Thank you.
iMac Line (2012 and Later)
Yasemo wrote:
It wont let download a new version of Mojave through the App store, just an update. All the tutorials show that once you correctly erase and partition the SSD it should show up as an option in System Preferences > Start up disk, but mine is not. I dont think installing Mojave would help because it isn't even being recognized as a start up disk, no?
You need a bootable OS for Startup Disk to see a bootable options. A blank drive is a blank drive. Blank drives cannot boot.
I one video, all he did was partition then restart his iMac pressing option, and it gave him the option to choose the SSD instead of the original HD. It then gave him the option to reinstall Mojave from there. When I get to the choose start up disk part, it only shows my original HD. There must be something im missing or the process has been changed by a new OS update??
You must either boot a USB macOS installer or boot into Recovery Mode (Command + R) or Internet Recovery Mode (Command + Option + R). Make sure the external drive is erased using GUID partition and MacOS Extended (Journaled) or possibly APFS. Make sure to select the correct drive.
Yasemo wrote:
It wont let download a new version of Mojave through the App store, just an update. All the tutorials show that once you correctly erase and partition the SSD it should show up as an option in System Preferences > Start up disk, but mine is not. I dont think installing Mojave would help because it isn't even being recognized as a start up disk, no?
You need a bootable OS for Startup Disk to see a bootable options. A blank drive is a blank drive. Blank drives cannot boot.
I one video, all he did was partition then restart his iMac pressing option, and it gave him the option to choose the SSD instead of the original HD. It then gave him the option to reinstall Mojave from there. When I get to the choose start up disk part, it only shows my original HD. There must be something im missing or the process has been changed by a new OS update??
You must either boot a USB macOS installer or boot into Recovery Mode (Command + R) or Internet Recovery Mode (Command + Option + R). Make sure the external drive is erased using GUID partition and MacOS Extended (Journaled) or possibly APFS. Make sure to select the correct drive.
See Carbon Copy Cloner Mac Backup Software | Carbon Copy Cloner | Bombich Software
Boot clone https://discussions.apple.com/docs/DOC-10081
3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.
Yasemo wrote:
Thanks for the links, but im actually looking to install a fresh version of Mojave. (If the links you shared show you how I apologize, I just dont see any there)
Create a Bootable USB Flash Drive | Microsoft Docs
https://itunes.apple.com/us/app/macos-mojave/id1398502828?mt=12
Ok ok so im running the latest version of Mojave, how do I install it on the SSD? The app store only allows updates. Thank you for the fast reply!
Edit: Also the tutorials said you could just choose it without installing an OS, is this not applicable to newer OS? These tutorials are a few years old.
It wont let download a new version of Mojave through the App store, just an update. All the tutorials show that once you correctly erase and partition the SSD it should show up as an option in System Preferences > Start up disk, but mine is not. I dont think installing Mojave would help because it isn't even being recognized as a start up disk, no? I one video, all he did was partition then restart his iMac pressing option, and it gave him the option to choose the SSD instead of the original HD. It then gave him the option to reinstall Mojave from there. When I get to the choose start up disk part, it only shows my original HD. There must be something im missing or the process has been changed by a new OS update??
You need to install an operating system on it before it will be seen as bootable
Thanks for the links, but im actually looking to install a fresh version of Mojave. (If the links you shared show you how I apologize, I just dont see any there)
Download Mac OS Mojave
Thank you thank you thank you! Followed your steps and everything seems good. Cheers
External SSD not showing up at all as bootable startup disk...
