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Booting Windows XP using Grub4dos and ramdisk.sys

xp ram boot ramdisk.sys

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#1 snoopy

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Posted 4 weeks ago

Hello everyone!

 

I have a RAW partition (super-floppy) image with Windows XP installed and successfully boot it from RAM using NTLDR and ramdisk.sys. No 3-d party tools are used.

 

Question: can I compress that image and boot it using Grub4dos or any other tool without installing additional 3-d party drivers?


Edited by snoopy, 4 weeks ago.


#2 Wonko the Sane

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Posted 4 weeks ago

Hello everyone!

 

I have a RAW partition (super-floppy) image with Windows XP installed and successfully boot it from RAM using NTLDR and ramdisk.sys. No 3-d party tools are used.

 

Question: can I compress that image and boot it using Grub4dos or any other tool without installing additional 3-d party drivers?

Answer:

How are we supposed to know, without knowing EXACTLY what you are doing already? :unsure:

 

More or less it should be the one or the other variation of Euhenio's method :dubbio: 

https://web.archive....euhenio.mam.by/

At the time:

http://reboot.pro/to...amboot-booting/

 

dennis123123 used a NTFS compresed image just fine:

https://web.archive....rt=#entry127683

 

https://web.archive....rt=#entry127735

 

If this is the question. :unsure:

 

:duff:

Wonko



#3 snoopy

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Posted 4 weeks ago

Answer:

How are we supposed to know, without knowing EXACTLY what you are doing already? :unsure:

 

I have 4 files: boot.ini, ntdetect.com, ntldr and boot.ima, which contains formatted partition with Windows XP (full, not PE).

 

When all this starting to boot, ntldr writes boot.ima into the RAM and then boots Winbows XP from ramdisk(0). Everything's fine.

 

Question was: can I reduce the size of boot.ima, using some tools or methods, but without installing additional 3-d party drivers?

 

I know that Grub4dos can boot lzma, gzip and lz4 images, but how should ntldr deal with that?

 

I think that at first somebody should unpack boot image into the RAM; then it should hook INT13 and INT15 and start ntldr which will load that image... from RAM to RAM and then boot it. That's bad, since it takes two time more RAM.

 

P.S.

I was looking at W2k3's ntldr in the hex editor and found there some interesting words: "Unsupported compression format" and "Can't allocate compression buffer". I think it means that W2k3's ntldr supports CAB file compression. But I can be mistaken.

 

Thank you for trying to help!



#4 Wonko the Sane

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Posted 3 weeks ago

What are the contents of boot.ini?

How big (size in bytes) is the .ima?

Is it a partitioned image or just a "supre-floppy" image?

 

How (exactly) are you booting/loading/chainloading the NTLDR?

(using grub4dos it would be normally possible to move boot.ini, NTLDR and NTDETECT.COM to inside the image)

 

If the filesystem in the partition is NTFS, you can use, as hinted, compression of NTFS, thus allowing you to make a smaller image.

 

NTFS compression is not that bad, I doubt that it will be less efficient than gzip, maybe lxma or lz4 may provide some (marginal) advantages in size.

 

There is also another possibility, using a cab compressed image, in the good ol'days it was possible to use in PE 1.x instead of .iso a cab compressed .is_ image, most probably the same can be done with your full XP but it will use a lot of memory (this is more or less what you just proposed, which is built-in in SETUPLDR.BIN and maybe also in NTLDR):

https://web.archive....showtopic=19737

 

In the case of the PE there are some possible patches around, see also:

http://reboot.pro/to...-with-grub4dos/

that most probably can be used to modify also a "full XP", but it has to be seen. :unsure:

 

:duff:

Wonko



#5 Wonko the Sane

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Posted 2 weeks ago

Posting this just to see if the main page index gets updated (the above post was submitted but the main page index still showed the last post as the one by snoopy).

Please ignore.

 

EDIT: No it doesn't work.

 

:duff:

Wonko



#6 wean_irdeh

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Posted 2 weeks ago

Posting this just to see if the main page index gets updated (the above post was submitted but the main page index still showed the last post as the one by snoopy).

Please ignore.

 

EDIT: No it doesn't work.

 

:duff:

Wonko

 

Weird? what is happening lately?



#7 wean_irdeh

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Posted 2 weeks ago

multiple post please delete this
 


Edited by wean_irdeh, 2 weeks ago.


#8 wean_irdeh

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Posted 2 weeks ago

multiple post please delete this
 


Edited by wean_irdeh, 2 weeks ago.





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