Hi
Is there a book or someting like which i can refer to for these knowledge
about disks , images files and partitions .
I don't know how to mount a partition in a image file with offset .I want to
know detailed knowledge about this . I hope you can give me an advice.
Thanks.
On Fri, Apr 22, 2011 at 1:06 PM, Neal Murphy neal.p.mur...@alum.wpi.eduwrote:
On Friday 22 April 2011 00:34:42 Mike McCarty wrote:
Neal Murphy wrote:
Bother! Clicked the wrong button!
[nice stuff snipped]
I very much appreciate the suggestions for PT editors. Thanks!
However, I'd like to get an answer to the question about the
offsets within the file to get to the starts of the file systems.
Am I missing something, like I need to allow for the BPB at the
beginning of some of the partitions? Something like that? If so,
then why does volume 2 mount w/o problem, based upon the computed
offsets. What does fdisk mean when it says that the physical and
logical start/end of a volume are not the same? I understand the
usual layout of an MBR and the PT, and I'm not sure what
inconsistency there can be, unless the BPB and the PT disagree
in some way.
Oh, duh. Out! Out, demons of stupidity! I inwardly sneer at others who
don't
answer the posed question. Then I go and do it myself.
To answer your question, your VM system probably has some stuff at the
beginning of the image, which is another offset to account for. Your fdisk
output looks like this is the case.
The difference between physical and logical start/end is most likely the
difference between CHS/sector counting and LBA counting; fdisk is saying
they
don't line up. You probably don't have the correct offset(s). When you get
it
right, fdisk won't know it's not looking at a hard drive.
Make a fresh, small-ish image file for your VM system, boot something, make
a
partition at the beginning, put EXT3 on it, then 'od -c|head' that node and
remember the byte pattern at the beginning. Then put a known unique-ish
data
pattern in the boot sector. Close and exit the VM and look for those byte
patterns. That'll give you the offset for the VM system and the offset for
the
boot sectors/partition table/multi-disk info. Yes, you can probably find
the
info on the web somewhere, but it's much more gratifying to find it
yourself
eh.
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