View Single Post
  #13  
Old April 27th 17, 03:13 PM posted to alt.comp.os.windows-8
philo
external usenet poster
 
Posts: 4,807
Default Recovering UEFI boot entries after clear CMOS

On 04/26/2017 03:23 PM, Tim wrote:
"Mr. Man-wai Chang" wrote in
news
On 26/4/2017 12:12 PM, Tim wrote:
I believe that after the CMOS is cleared, the system will start
scanning the hard/ssd drives starting at disk 0 until it finds a
valid boot block.

You should be able to enter the UEFI Bios after clearing the CMOS and
select which drive to boot from. As part of the boot process the BIOS
scans all of the drives to make a list of what is there.


Did you test this?

No, I haven't actually cleared my CMOS to see what happens, but my UEFI
Bios shows me a list of my hard drives identified by manufacturer and model
number, and where else would it get that info except by scanning all of the
possible connections and pulling in the ID stored in every hard drive.

I do know from experiece that the Bios will scan all of the drives for a
boot sector. My system drive/disk (an SSD with nothing else on it but
Windows) decided to die on me right in the middle of upgrading to Win 10.
When I rebooted it found my online backup of that drive and booted from
that with no imput from me.




I just built a new machine and had to make one change in the bios to
enable "legacy" in order to get the system to boot.

I would imagine that if I cleared CMOS I'd have to make that same change .

In other words best to note any changes before clearing CMOS

Whenever I work on a machine if there is anything of significance I need
to do I make a note of it and tape it to the back of the machine
Ads