How to install external Thunderbolt 3 SSD to use as startup drive for iMac 2019
Hello~ I have been suffering with an extremely slow hard drive for months, probably years. I finally got serious with etrecheck and it suggests using an external Thunderbolt 3 SSD drive for the startup drive. I have purchased that and am ready to move forward.
My question is, how do I load the OS there, and once I've done that, how do I start up from that disk in the future?
Thanks so much - I've googled everything I can think of & can't find solid info. Attaching the report for reference. PS. I do have my info backed up.
iMac 21.5″, macOS 12.3