Formating FAT32, but linux created FAT32 is not like win created FAT32?? Difference?

tredegar · 07-19-2010, 12:28 PM

Quote:

PBR - Partition Boot Record (Second Stage Bootloader)

Thank you, I just looked it up.

I am about to go offline for a while.

If you fail to make progress, please consider sending the LQ user Saikee a (polite) "Private Message" asking him to take a look at this thread, when he has the time (you would, of course, give him the link to it!).

One way to do this:
Use LQ's Search to locate a post by him, or just go here: http://www.linuxquestions.org/questi...2/#post4034125
Click on his name at the left.... Send email to Saikee.

He is awesome when it comes to multi-boot, grub, grub2 and "chainloading". And I think he also boots win (which I don't, so my grub is relatively simple to set up).

Good luck, I'll follow up this thread when I get back.

HTH

boki15 · 07-19-2010, 12:48 PM

Here is the log:
1st I formated with win, booted ubuntu,installed 1. syslinux 2. grub2, extracted mbr&pbr (WIN-x), formated with mkfs.vfat, and again installed syslinux&grub2, then extracted again mbr&pbr (LINUX-x)

Code:

#~$ sudo umount /dev/sdb1
#~$ sudo ./syslinux/linux/syslinux /dev/sdb1
#~$ sudo mkdir /media/test
#~$ sudo mount /dev/sdb1 /media/test
#~$ sudo grub-install --no-floppy --root-directory=/media/test /dev/sdb
Installation finished. No error reported.
#~$ sudo dd if=/dev/sdb of=/media/500gbUSB/test2/WIN-grub2-backup.mbr bs=512 count=1
1+0 Datensätze ein
1+0 Datensätze aus
512 Bytes (512 B) kopiert, 0,000202121 s, 2,5 MB/s
#~$ sudo dd if=/dev/sdb1 of=/media/500gbUSB/test2/WIN-sysliux-backup.pbr bs=512 count=1
1+0 Datensätze ein
1+0 Datensätze aus
512 Bytes (512 B) kopiert, 0,00017593 s, 2,9 MB/s
#~$ sudo umount /dev/sdb1
#~$ sudo rm -R /media/test
#~$ sudo mkfs.vfat -n 8GBMSDHC /dev/sdb1
mkfs.vfat 3.0.7 (24 Dec 2009)
#~$ sudo ./syslinux/linux/syslinux /dev/sdb1#~$ sudo mkdir /media/test#~$ sudo mount /dev/sdb1 /media/test#~$ sudo grub-install --no-floppy --root-directory=/media/test /dev/sdb
Installation finished. No error reported.
#~$ sudo dd if=/dev/sdb of=/media/500gbUSB/test2/LINUX-grub2-backup.mbr bs=512 count=1
1+0 Datensätze ein
1+0 Datensätze aus
512 Bytes (512 B) kopiert, 0,000151416 s, 3,4 MB/s
#~$ sudo dd if=/dev/sdb1 of=/media/500gbUSB/test2/LINUX-sysliux-backup.pbr bs=512 count=1
1+0 Datensätze ein
1+0 Datensätze aus
512 Bytes (512 B) kopiert, 0,000212108 s, 2,4 MB/s

I uploaded extracted pbrs and mbrs here (if you want to compare them)
HASHCODES

Code:

WIN-grub2-backup.mbr:
md5: 0c846a5645727e4b7e8bfcb20a2fd633
sha1: 4ababd2ef1fd827fe702421fb0aaafbba9dd096b

LINUX-grub2-backup.mbr:
md5: 0c846a5645727e4b7e8bfcb20a2fd633
sha1: 4ababd2ef1fd827fe702421fb0aaafbba9dd096b

WIN-syslinux-backup.pbr:
md5: 8e97fffeff8f9b3bab48ac5cfe55d485
sha1: c0fc1f757a9573f9308aaa61879421dc31824b15

LINUX-syslinux-backup.pbr:
md5: 67a4f1ed8c4be71b7889845a3f4a5455
sha1: 01f4a9412bd5a3f27f94d71e26a9057081db5a0d

We can see on hash codes that mbr is completly the same, so it could be syslinux related (pbr is not the same). Here are the dump files and you can see that PBR is completly different (as long as I see only from begin until "FAT32 "

Win

Code:

.X.MSDOS5.0

Linux (mkfs.vfat)

Code:

.X.msdosfs

boki15 · 07-19-2010, 12:54 PM

thanks for advices, I'll contact him. I still hope to solve it by myself. It's just anoying to have script which does everything, except formating. I want to avoid need for commercial software (ms) to create multiboot usb.

boki15 · 07-21-2010, 01:41 AM

Ok I got the problem

, preparing the solution, going to post later everything with logs.

GrapefruiTgirl · 07-21-2010, 04:41 AM

Excellent! Looking forward to this..