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 Multiboot ISO - Grub on ext3, ISO on fat32
post May 15 2010, 10:34 PM
Post #1
czaroli
  
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I'm looking for a solution where:
1) Pen Drive 32 GB
2) flash drive has two partitions (ext3 and fat32)
3) install a partition ext3 grub2 + burg
4) on the fat32 partition, copy ubuntu.iso, windows.iso, hirens.iso etc. ....

Why ext3 partition?
Because it is safe, no need to fear that by chance erase grub

In the grub menu, set to run ISO files permanently.

Does anyone know how to install grub on ext3 in order to run the ISO from other fat32 partcji?


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post May 16 2010, 08:28 AM
Post #2
Wonko the Sane
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QUOTE (czaroli @ May 16 2010, 12:34 AM) *
Why ext3 partition?
Because it is safe, no need to fear that by chance erase grub


Hmm. dubbio.gif
Care to expand on this? unsure.gif

cheers.gif
Wonko


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post May 16 2010, 01:02 PM
Post #3
Sha0
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I'll bet "GRUB2" has a manual somewhere, including instructions for how to install it on a partition with an EXT3 filesystem.
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post May 16 2010, 05:37 PM
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czaroli
  
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why are all using GRUB4DOS? and a fat32 partition?

Below is a PenDrive (two partitions):
------------------------------------------------------
| Ext3 (grub) | fat32 for ISO |
------------------------------------------------------

Exe3 partition will not see Windows users (my son), and nothing will break or will not erase anything.

On the fat32 partitions, will be readme.txt
In the readme.txt will be written:

If you want the grub menu, run the installation windows xp ISO throw here called winxp.iso, etc....

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post May 16 2010, 05:57 PM
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Wonko the Sane
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QUOTE (czaroli @ May 16 2010, 06:37 PM) *
why are all using GRUB4DOS?

Most probably because it has been around for some more time, it is almost fully documented and has some nice features that - unless I am mistaken - do miss from grub2.

QUOTE (czaroli @ May 16 2010, 06:37 PM) *
and a fat32 partition?

Mostly becuase people usually needs to access the files, and FAT32 is pretty much cross-platform.

QUOTE (czaroli @ May 16 2010, 06:37 PM) *
Exe3 partition will not see Windows users (my son), and nothing will break or will not erase anything.

I don't see any advantage in this when compared to a hidden partition (and yes grub4dos can reside on a hidden partition), and seems to me like having a lot of drawbacks, as most windows systems won't by default be able to read a second partition.

A "safer", though rather complex setup is talked about here:
http://www.boot-land.net/forums/index.php?...ic=7138&hl=

Remember that unless a CD-rom like device is implemented on the stick (like U3 or some sticks that provide for two LUN's) the USB stick remains writable, and a number of tools may be able to access it, expecially the MBR , with a fair possibility of ruining it.

cheers.gif
Wonko


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post May 28 2010, 04:16 PM
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Alloishus
  
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For the original request though, and not to hijack anything, but Grub doesn't care about file systems. Right?

I mean, grub loaded into MBR, then loaded from wherever, and then it is just a matter of telling it what partition either another loader or device can be found.

You just have to answer the question of how much you want grub to be involved (pass parameters, or chainload).

so..for device (hd0,0 is ext3), (hd0,1 would be fat32), etc for how many ever partitions.

I think what the op was looking for was that natively Windows will not see an ext3 partition (the grub partition on the boot device, but would see the isos I would guess), once the Windows system is booted. I am not sure what that would matter since he could just reformat it in Windows to begin with. Right? Sooo....uh, I guess I agree with the last post for the same reason (the point?), but different methodology.

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post May 28 2010, 05:11 PM
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Wonko the Sane
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QUOTE (Alloishus @ May 28 2010, 05:16 PM) *
For the original request though, and not to hijack anything, but Grub doesn't care about file systems. Right?

I mean, grub loaded into MBR, then loaded from wherever, and then it is just a matter of telling it what partition either another loader or device can be found.

Please define "wherever"....

QUOTE (Alloishus @ May 28 2010, 05:16 PM) *
I think what the op was looking for was that natively Windows will not see an ext3 partition (the grub partition on the boot device, but would see the isos I would guess), once the Windows system is booted. I am not sure what that would matter since he could just reformat it in Windows to begin with. Right? Sooo....uh, I guess I agree with the last post for the same reason (the point?), but different methodology.

I will repeat (just in case).
ANY "normal" NT based system will see most (please read as "ALL") USB sticks as "Removable" device, and will ONLY mount and let access one single partition on it.
This is INDEPENDENT from the filesystem the UNSEEN/UNMOUNTABLE under windows partition is formatted with.
Any "normal" DOS based system will NOT access a "hidden" partition, and will only access unhidden ones, and this also has NO relation with the filesystem the hidden partition is formatted with.
grub4dos can access ANY partition, even hidden ones, as long as they are formatted as FAT12, 16, 32, NTFS or EXT2/3.
So, using Ext3 is only a more complex than needed approach for resolving the posted problem.

cheers.gif
Wonko


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post May 29 2010, 01:36 AM
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Alloishus
  
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yeah, I guess that was a dumb thing of me to say.

The original op didn't mention grub4dos. So, I was thinking more of grub, and grub non-native at that.

grub supports more file systems than grub4dos. Nonetheless, my statements were inaccurate anyhow.

By where ever, I was referring to a non-native grub boot. In that case, the boot sector isn't necessarily the MBR, and grub can call grub, so to speak. That can lead to lots of options if you are willing to use ext3 (or almost any linux filesystem).

Sorry for the confusion...you are clearly more accurate (and, of course, the response is appropriate).
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post May 29 2010, 09:48 AM
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Wonko the Sane
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QUOTE (Alloishus @ May 29 2010, 03:36 AM) *
yeah, I guess that was a dumb thing of me to say.
....
Sorry for the confusion...you are clearly more accurate (and, of course, the response is appropriate).


Naah, it wasn't dumb at all smile.gif, you perfectly caught the spirit of the OP thumbup.gif , as well as I tried to bring everyone back to "common sense advice" points #f1 and #f2:
http://www.boot-land.net/forums/index.php?showtopic=9101
and quickly applied Occam's Razor. wink.gif
http://en.wikipedia.org/wiki/Occam's_razor


Obviously everyone is perfectly free to use gujin on a EXt3 partition to load GRUB legacy to load NTLDR to load grub4dos to load grub2 to load grub4dos to load a .iso, but it sounds like a bit overkill.... happy22.gif

cheers.gif
Wonko


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