PB won't install on external SSD

[aevan]

When I run the installer and click on show all disks, my internal drives are available for Sierra, but the two external drives (one of them being Thunderbolt SSD and the other USB HDD) are grayed out. Clicking on them displays "This disk cannot be used to start up your computer". Note that I have formatted the SSD as Extended (Journaled) GUID Partition Map - as I'm supposed to.

Here's a screenshot:

https://www.dropbox.com/s/lc1u1tw72wotal2/Screenshot 2016-07-07 23.04.17.png?dl=0

Anyone has any ideas?

 

[dsjr2006]

Do you have FileVault enabled? Also do you have a Recovery partition on the internal drive?

 

[aevan]

Do you have FileVault enabled? Also do you have a Recovery partition on the internal drive?

I don't have FileVault enabled, and there is a recovery partition on the internal drive, yes.

 

[VictoryHighway]

Are the external drives setup for GUID Partition Table?

 

[simon lefisch]

Did you make a USB installer?

 

[aevan]

Are the external drives setup for GUID Partition Table?

Yes.
[doublepost=1467958215][/doublepost]

Did you make a USB installer?

No, didn't have a flash usb nearby, I was hoping to avoid that. Going to try that later.

 

[Weaselboy]

When I run the installer and click on show all disks, my internal drives are available for Sierra, but the two external drives (one of them being Thunderbolt SSD and the other USB HDD) are grayed out. Clicking on them displays "This disk cannot be used to start up your computer". Note that I have formatted the SSD as Extended (Journaled) GUID Partition Map - as I'm supposed to.

Here's a screenshot:

https://www.dropbox.com/s/lc1u1tw72wotal2/Screenshot 2016-07-07 23.04.17.png?dl=0

Anyone has any ideas?

It sounds like you have done everything correctly. With the drives attached, run the command below in Terminal and tell us the output.

diskutil list

This will show the format and volume layout of the drives.

 

[aevan]

diskutil list

This will show the format and volume layout of the drives.

I did, and it shows that the format is correct, I believe. Never mind, thanks everyone - I'll either do an USB install or just wait out for the real thing

Once again, thanks.