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.edu>wrote: > 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. > -- > http://linuxfromscratch.org/mailman/listinfo/lfs-support > FAQ: http://www.linuxfromscratch.org/lfs/faq.html > Unsubscribe: See the above information page >
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