Link to the image is on imgur: http://imgur.com/a/a0cee

good evening everyone!

I have the following set-up:

an i7 with 2 HDDs:

First HDD) a 3 TB HDD dedicated to a licensed Windows 10 pro 64 bits

Second HDD) a 2 TB HDD shared between 2 linux distros: a CentOS 7 KDE and a Linux Mint 18 Cinnamon (both 64 bits)

-----------------------------------------------

I bought this PC as bare-bones (without and os).

First, i proceeded to install the Windows 10 64, on the 3TB HDD (on the first HDD). So windows has an entire HDD all to itself.


Then, on the second HDD, the 2 TB one, i proceeded to install, in the following order:
1) CentOS 7 KDE all inclusive (i used a USB stick to boot and install)
and then:
2) Linux Mint 18 Cinnamon with its GRUB2.

So, the Linux Mint 18's GRUB2 controls all booting proccesses and boot order.

On the Linux Mint 18, i also have grub-customizer.

The attached screenshots both show the same thing:
Screenshot 1 --- is the shell with the command df -h
and
Screenshot 2 -- same thing, except i used the disks utility of Mint 18 Cinnamon

In either screenshot, you will see the following:
- sda: is the 3 TB windows hdd
- sdb: is tne 2 TB hdd which is shared between the linux partitions.

On sdb:
sdb 1, sdb2 and sdb 3 --- all these belong to the CentOS 7 installation
sdb 4, sdb 5 and sdb 6 --- all these belong to the Mint 18 Cinnamon installation (this is the one which also controls the GRUB2)

PROBLEM: seeing as i have an AMD Radeon RX470 4 GBDDR5 graphics board, i tried to install the official drivers in CentOS 7.

This operation went great in Linux Mint 18...but not good at all in CentOS 7!

Now i want to re-install the CentOS 7, but i do not want to mess up the grub2 bootloader (and centos 7 also has grub2!)

if i do a regular re-install it will mess up the GRUb2 by re-writing it!

How precisely do i reinstall CentOS 7, without affecting/re-writing the GRUB2, and without affecting the other OSes boot order?

Thanks

so you are wanting to keep
So, the Linux Mint 18's GRUB2 controls all booting proccesses and boot order.

On the Linux Mint 18, i also have grub-customizer.
as the main loader?

just install your other Linux. have it install grub and take over, boot into it making sure it is in working order. then reboot using its grub listing to get into the MINT
mint retakes control

1 members found this post helpful.

Moved: This thread is more suitable in <CentOS> and has been moved accordingly to help your thread/question get the exposure it deserves.

Guess you could save grub info and then copy it back but almost no one does it that way. In most installers you can skip installing a loader and if all things work, you can boot like you used to. You'd have to check how your loader is configured.

xyproblem.

In what way?

The demand for an answer - that is irrelevant and will cause respondants to go chasing around unnecessarily.