Re: [gentoo-user] Re: OFF TOPIC Need Ubuntu network help

[Dale <rdalek1967@gmail.com>]

Grant Edwards wrote:
> On 2023-10-18, Michael <confabulate@kintzios.com> wrote:
>
>>> Oh, and if you use GPT, you no longer need the MBR compatibility
>>> partition, or whatever its called. I no longer need it so I can't
>>> remember the exact name.
>> Man pages of partitioning tools refer to it as "Protective MBR", although I've 
>> seen it mentioned in the interwebs as "protective GPT", which I think is more 
>> accurate.  It uses the first sector (LBA 0) to store an MBR table showing the 
>> whole disk, or 2TB if smaller, as an MBR partition.  This is the first 
>> partition on the disk, typically 1 MiB in size.  It is meant to stop 20 year 
>> old partitioning tools from messing up a GPT partitioning scheme because they 
>> can't see it.  Arguably nobody uses Windows 98 these days, so it should be 
>> safe to not have a protective MBR on your GPT disks.
> The protective MBR and the BIOS boot partition are two different,
> unrelated things. The BIOS boot partition is a real partition (usually
> 1-2MB in size) that's present in the GPT parition table. It's used by
> Grub as a place to store its files. It must be the first partition,
> and it doesn't have a real filesystem (grub uses some sort of private
> filesystem):
>
>     $ sudo fdisk -l /dev/nvme0n1
>     Disk /dev/nvme0n1: 465.76 GiB, 500107862016 bytes, 976773168 sectors
>     Disk model: Samsung SSD 980 PRO 500GB               
>     Units: sectors of 1 * 512 = 512 bytes
>     Sector size (logical/physical): 512 bytes / 512 bytes
>     I/O size (minimum/optimal): 512 bytes / 512 bytes
>     Disklabel type: gpt
>     Disk identifier: E81DD16A-A5AE-3C4A-AD3C-26DF2985827A
>     
>     Device             Start       End   Sectors   Size Type
>     /dev/nvme0n1p1      2048      6143      4096     2M BIOS boot
>     /dev/nvme0n1p2      6144 134219775 134213632    64G Linux filesystem
>     /dev/nvme0n1p3 134219776 976773134 842553359 401.8G Linux filesystem
>
>
>
>
>


I usually use cgdisk, or cfdisk, but they all do the same thing.  Just a
different interface.  As long as all this is documented, I'll just
follow it and it should work.  After all, efi has been around for a long
while now.  I'm sure millions of people have it installed, likely
billions. 

I do wonder, can one still put things like memtest, Knoppix and such in
that thing?  I'm sure it can be done but never seen it mentioned.  I
started to put it on the old 770T but didn't now that I have that Ventoy
USB thing. 

It's going to be a while before I have to do this.  I still haven't
found a mobo.  Not one I really like anyway. 

Dale

:-)  :-)