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Dual Boot Two Debian Versions

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My Debian platform has four drives:

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
??????sda1 8:1 0 457.9G 0 part /
??????sda2 8:2 0 1K 0 part
??????sda5 8:5 0 7.9G 0 part [SWAP]
sdb 8:16 0 1.8T 0 disk
??????sdb1 8:17 0 1.8T 0 part /sdb1
??????sdb2 8:18 0 1K 0 part
??????sdb5 8:21 0 7.9G 0 part
sdc 8:32 0 465.8G 0 disk
??????sdc1 8:33 0 465.8G 0 part /sdc1
sr0 11:0 1 2K 0 rom

sda is a 500 GB SSD, currently the boot drive, running Stretch
sdb is a 2 TB mechanical hard drive, used for storage and
sbc is a 500 GD SSD, containg a number of computational chemistry 
applications that I use for my research.

I am planning on adding a 1 TB SSD to the system to be dedicated to 
Buster (currently Testing).

I know that if I select the new drive (for the purpose of this note, 
sdd) for Buster during the installation process from the iso DVD, that 
Buster will be installed on sdd and grub will show that as the boot 
drive. There would also be an entry in grub for Stretch on sda.

Herein lies the problem, sda is the boot drive, but Buster would not be 
a grub entry. Whenever I reboot the system, Buster will be hidden. A 
workaround would be to hit the appropriate key during the initial stages 
of the boot process to open the Bios and then manually select Buster to 
boot.

Couple of questions:

Will installing Buster on sdd do anything to make Stretch unbootable?
Is there a way that I can add Buster to the Stretch Grub Boot Screen? 
Perhaps grub-customizer?

I know this is rather convoluted, but it is essential, for non technical 
reasons to keep Stretch available while I am using Buster.

Thanks in advance.

-- 
Stephen P. Molnar, Ph.D.          Life is a fuzzy set
www.molecular-modeling.net         Stochastic and multivariate
(614)312-7528(c)
Skype:  smolnar1

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Dual Boot Two Debian Versions "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-06-10 16:10 +0200
  Re: Dual Boot Two Debian Versions Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-06-10 20:10 +0200
  Re: Dual Boot Two Debian Versions David Christensen <dpchrist@holgerdanske.com> - 2019-06-11 04:50 +0200
  Re: Dual Boot Two Debian Versions songbird <songbird@anthive.com> - 2019-06-11 13:40 +0200
    Re: Dual Boot Two Debian Versions Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-06-11 20:30 +0200
      Re: Dual Boot Two Debian Versions "Stephen P. Molnar" <s.molnar@sbcglobal.net> - 2019-06-11 21:50 +0200
        Re: Dual Boot Two Debian Versions Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-06-12 21:20 +0200

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