Slow boot (black screen before Apple logo) after HFS+ to APFS conversion of external boot SSD USB-C

[IowaLynn]

I cloned my MacBook Catalina to Samsung T5 500GB which went quickly, then restarted off the T5. These are excellent drives.

I didn’t install to T5. Show all volumes though is now needed to properly do APFS format now in DU.

 

[larzy]

I have the same problem - right now I have the standard Catalina operation system on the iMac's fusion drive that came installed on the machine. And then an external Samsung T5 ssd where I also installed a copy. Would it help if I wipe the fusion drive so that drive is just an internal storage place (which is what I planned) or will the boot up process still be slow because the system is looking if there's anything else besides the ssd that has a boot record?

 

[Del Rei]

Did anyone find a good solution to fix it without needing to clone the disk and having problem with updates?

I have the same problem - right now I have the standard Catalina operation system on the iMac's fusion drive that came installed on the machine. And then an external Samsung T5 ssd where I also installed a copy. Would it help if I wipe the fusion drive so that drive is just an internal storage place (which is what I planned) or will the boot up process still be slow because the system is looking if there's anything else besides the ssd that has a boot record?

Well... I'm not sure, but if you remove the Fusion and the computer still wait take 20s to find the boot disk, I would say this is a nightmare... Installing the SSD internally should fix it.

 

[Del Rei]

Ok... Any improvement from Big Sur?