Wondering that too.I'm wondering if there is -something- in the USB3/SATA dock that is "getting in the way" of the installer booting from it.
OP:
You might need to try a different external enclosure or perhaps a USB3/SATA adapter/dongle...
I do not have anything else connected. The drive shows up in disk utility. It does not show up in the option boot screen. and it does not show up in startup disk.Yes, that's a possible direction to try. Quickest is to try a different USB cable.
OWC support is usually good, in my experience. As you have both the drive dock AND your SSD from OWC, maybe they would have a better answer, too.
[doublepost=1565724559][/doublepost]Make sure that you don't have any other devices attached to your mini (other than keyboard/mouse and display, plus whatever network connection) NO other storage devices or printers, etc.
please try to give just a little more detail about what happens. Such as - does the drive even appear in Disk Utility? Does it appear on the Option-boot screen. Does ANYTHING, other than your internal boot drive, appear on the Option-boot screen?
Same question, if you boot to your internal system, and open System Preferences/Startup Disk... does anything appear, other than the internal drive? Again, unlock to make sure that pane displays everything possible (and allows you to change boot drive, if you should want to do that)
So, it never boots by itself, just copies the system files, then restarts for the install to complete, but never gets there (?)I do not have anything else connected. The drive shows up in disk utility. It does not show up in the option boot screen. and it does not show up in startup disk.
wellander is already running Mojave. The 10.13.6 combo update is not likely to be helpful, is it?Ok I see what's going on here. Did you receive a firmware update to allow the Mini to allow APFS volume to be bootable?!?
If not, then your APFS can not be booted; it will revert to your HD. You need to download the 10.13.6 combo update from Apple from their website (don't use app store) and run it. This will fix your missing firmware on the Mini and will allow booting from the APFS volume.
wellander is already running Mojave. The 10.13.6 combo update is not likely to be helpful, is it?
Plus, booting to the Mojave installer would do the same bootrom update (newer than the bootrom update from High Sierra, eh?) So, unless there is something unique about downgrading to High Sierra - if you could share what that is, I'm sure it would be helpful.
If what you say is true, then all wellander1 needs to do is make a bootable installer for High Sierra, install that on the external SSD. The install includes the EFI update, then boot to the Mojave installer, erase, install Mojave, and then should boot.
That is assuming that OP had never installed 10.3.6 on a 2014 mini. Seems unlikely to me --- but what do you say, @wellander1 ? Did you have High Sierra 10.3.6 installed on your internal HDD before upgrading to Mojave?
I have 10.13.6 installed on the mini at the time.
Hardware Overview:
Model Name: Mac mini
Model Identifier: Macmini7,1
Processor Name: Intel Core i5
Processor Speed: 2.6 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache (per Core): 256 KB
L3 Cache: 3 MB
Memory: 8 GB
Boot ROM Version: 244.0.0.0.0
SMC Version (system): 2.24f32
Serial Number (system): C07WD2QEG1HW
Hardware UUID: 5ADBD20B-B22A-5AC2-BBC0-2582E039A5B7
This is what I see
Any recommendations on what to get then?
And if the drive is the problem any recommendations for a ssd?You can try this.. NexStar TX
https://www.amazon.com/Vantec-NexSt...d=1565826883&s=gateway&sr=8-2#customerReviews
This was the USB drive dock that Bombich Software (maker of Carbon Copy Cloner) said it is bootable from a system cloned drive; both in HFS+ and APFS since Carbon Copy Cloner was the first software to allow cloning and booting of APFS volume.
What is very interesting about this hard drive dock is the support of UASP (USB Attached SCSI). It's a faster USB 3.0 transfer protocol, especially when used as a boot disk over normal USB 3.0. Here's an attached article of someone who did a benchmark with UASP support USB 3.0 dock over Sierra (10.12.6). Difference between USB 3 and USAP is very noticeable especially with my Macs that has USB 3 ports. Initially I was surprised why this USB 3 dock allowed booting of both hard disks and SSDs faster than my other USB 3 devices, but copying and reading were the same. Only later I realized this dock supports UASP and booting from it is faster than booting off a normal USB 3 drive.
https://willhaley.com/blog/usb-3-uasp/
I'm sure others will be able to provide other docks and USB enclosures that would be bootable as well.
Everyone so far have good experiences with the Samsung EVO series of SSD. Good performance, durability and compatibility.And if the drive is the problem any recommendations for a ssd?
Update.
It is the dock.
I tried a different drive (Spinning HDD one) and the same issue. Even 10.13 will not install in it and boot.