Boot modern computer with Clonezilla CD, DOS-based test program CDs, etc.

I' m used to using various tools that are on Live CDs.  So, naturally, the disk has to be bootable.  
Let's assume this is a UEFI computer.  Let's also assume that the normal boot drive is GPT.

First thing, I guess, is to turn off Secure Boot.  That's easy enough it seems.
The next step isn't so obvious.  It seems that one could either:
1) build a GPT DVD with the tools on it.  So far, this goal seems elusive.
2) switch the computer from UEFI boot CSM.

So, for now, let's say that #1 is out of reach.  So, we'll use #2.
And, let's say that we want to run a hard drive test program .. a *particular* one.
So, we put in the Live CD for the disk test program and boot.
Some of these as DOS-based.  Some are Linux-based.  etc.
OH!  Now the system, being in CSM mode, doesn't see the hard drive... (is that correct?)

Where are things heading?  
What are the best approaches?
I don't want to have to "build" CDs/DVDs in some complicated fashion.  This isn't a hobby.
USB Flash drives either.
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Fred MarshallPrincipalAsked:
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OH!  Now the system, being in CSM mode, doesn't see the hard drive... (is that correct?)

No, that isn't correct. The disk is still seen from the BIOS, and that is all that is needed for it to be visible to disk diagnostic tools for example. Besides that, Linux has no problem with GPT disks anyway. Also current M$ OS's have no problems with GPT disks if it isn't the disk that you are trying to boot from. For example you can use an old PC with normal BIOS and boot windows normally from an MBR disk, and you can have a 2nd disk as GPT and will be able to access it from within Windows.
noxchoGlobal Support CoordinatorCommented:
You don't need the DVD built in EFI. Once you need to check something you switch simply the BIOS to compatible mode and boot the machine from your DVD. Then perform necessary tests.

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Fred MarshallPrincipalAuthor Commented:
OK.  So, the method would be:

- Switch the computer to CSM/BIOS... and this will take Secure Boot out of the picture for now.
- Boot to an old CD.
- Do the work such as test the GPT HD.
- Switch the computer back to UEFI from CSM.
- Boot as normal from the HD with NO worries about this working...

When will we have general DVDs built to boot in EFI do you think?
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there is no need for that, so there would currently be no plans for it.
noxchoGlobal Support CoordinatorCommented:
In 10 years maybe :) so don't fill your head with problems which could occur or not occur in future.
Fred MarshallPrincipalAuthor Commented:
Heh!  The "need" is for efficiency.  Too many reboots necessary to simply make one thing work.  

Just think:  Two added reboots required per evolution.  What if the exercise turns into a multi-evolutional process?  Added tedium.....
No longer can one say to a neophyte:  "Just run this CD."  But, OK, that doesn't happen that often anyway.  But *I'd* like to be able to "just run this CD".  I don't look to computers to make my life harder, rather easier.  

It will happen soon enough.  It will only take one and the others will follow.  Competition, whether technical or financial, is great!
I think for that type of user those CD's/DVD's would be too "high" anyway. Besides, What modern PC still comes with optical drives? Many Linux Distro's do work with UEFI and secureboot on.
Fred MarshallPrincipalAuthor Commented:
rindi:  I don't know.  I've read about the demise of optical drives.  I see they are disappearing from laptops and surely USB Flash drives are competitive in some context (and not in others).

Why does Microsoft continue to create Recovery Disks out of Windows then?

What does "too high" mean?
Windows doesn't create recovery disks out of Windows. Before Windows 8.x, the manufacturers had their own tools to create recovery media, and since Windows 8.x you can create recovery USB sticks with the recovery partition from within the control panel, but there is no option to create recovery DVD's.

I do still have and use DVD's, but many PC's don't include them anymore. You often need an external USB DVD drive then.
Fred MarshallPrincipalAuthor Commented:
rindi:  "Windows" does create a Recovery Disk.  Well, Windows 10 does.  It's in the Control Panel under Backup and Restore (Windows 7) which is new to Windows 10.  Here's what it looks like:
the screen shotI note that it does NOT give the option of using a USB Flash drive (there is one inserted on this system).

Here are the contents:

Folder PATH listing for volume Repair disc Windows 10 32-bit
Volume serial number is 81D3-8256
│   bootmgr
│   bootmgr.efi

│   │   bcd
│   │   boot.sdi
│   │   bootfix.bin
│   │
│   ├───fonts
│   │       chs_boot.ttf
│   │       cht_boot.ttf
│   │       jpn_boot.ttf
│   │       kor_boot.ttf
│   │       malgunn_boot.ttf
│   │       malgun_boot.ttf
│   │       meiryon_boot.ttf
│   │       meiryo_boot.ttf
│   │       msjhn_boot.ttf
│   │       msjh_boot.ttf
│   │       msyhn_boot.ttf
│   │       msyh_boot.ttf
│   │       segmono_boot.ttf
│   │       segoen_slboot.ttf
│   │       segoe_slboot.ttf
│   │       wgl4_boot.ttf
│   │
│   └───resources
│           bootres.dll

│   ├───boot
│   │       bootx64.efi
│   │
│   └───microsoft
│       └───boot
│           ├───fonts
│           │       chs_boot.ttf
│           │       cht_boot.ttf
│           │       jpn_boot.ttf
│           │       kor_boot.ttf
│           │       malgunn_boot.ttf
│           │       malgun_boot.ttf
│           │       meiryon_boot.ttf
│           │       meiryo_boot.ttf
│           │       msjhn_boot.ttf
│           │       msjh_boot.ttf
│           │       msyhn_boot.ttf
│           │       msyh_boot.ttf
│           │       segmono_boot.ttf
│           │       segoen_slboot.ttf
│           │       segoe_slboot.ttf
│           │       wgl4_boot.ttf
│           │
│           └───resources
│                   bootres.dll


This disk was generated on a non-UEFI Windows 10 Pro 32 system.  
It boots on other non-UEFI systems.
I can't verify right now if it will boot on UEFI systems in UEFI boot mode.  It looks from the file contents that it might.
That isn't a recovery disk, but rather a repair disk which you can use to try to repair some boot problems etc.
Fred MarshallPrincipalAuthor Commented:
rindi:  Well, I'm not going to recreate the entire, somewhat lengthy, evolution just to show a screen shot.  But, at the end of the process when you create a System Image there is a suggestion to create a Recovery Disk and to label it as such.  Mine says: "Windows 10 32 Recovery Disk" having followed those instructions.  Thus, I call it as they do: a Recovery Disk.

To use it for recovery (among other things its good for)  you have to have a System Image to go along with it (which would be unbootable).  So, you boot using this disk to recover the system image.  I did it.

When you boot to this disk, here is the menu sequence to do the image restoration:

Choose keyboard
Choose an Option
Advance Options
System Image Recovery
Windows 10
Select the System Image  (from the external USB drive where it's stored)...
Fred MarshallPrincipalAuthor Commented:
Thanks for the help and insights!
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