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Old April 26th 17, 05:12 AM posted to alt.comp.os.windows-10,alt.comp.os.windows-8,alt.windows7.general
Tim[_8_]
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Posts: 141
Default Recovering UEFI boot entries after clear CMOS

"Mr. Man-wai Chang" wrote in newsdnuj3$c5u$1
@dont-email.me:

On 26/4/2017 12:44 AM, Mark Lloyd wrote:
On 04/25/2017 06:19 AM, Mr. Man-wai Chang wrote:

How do you do that easily? Must I always keep a recovery disc ready? If
so, wouldn't it make things more complex than MBR boot?

The old MBR method can always boot even after a CMOS reset.


What did you change in setup? Boot order? Secure boot?


I just wanna find out whether the UEFI boot entry would stay in the CMOS
after I clear the CMOS. Anyone tested it before?

Ib the case of MBR boot, no boot entry was stored in the CMOS, so
clearing the CMOS would not affect the booting process.


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.

I keep a little table of all of the physical drives and which partitions
with their sizes are on which physical drive. That way I always have at
hand which drive/partition I was using as the system drive.
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