Re: [gentoo-user] He's baaaaaack!

[Zac Medico <zmedico@gmail.com>]

Richard Fish wrote:
> Martins Steinbergs wrote:
> 
>> log to linux, erase partition table, get those heads corect, write new 
>> partition table --> reboot, LBA is on and win is booting. none of 
>> dos/win apps worked for me to fix partition table.
>>
>> i asume LBA is needed only for win itself, not vfat or ntfs 
>> partitions, therefore files are accesible from linux
>>
>> martins
>>
>>  
>>
> 
> Um, if you do this, you will more than likely destroy the filesystems as 
> well, because the new partitions will not line up exactly with the old 
> ones.
> 

In most cases, with such a misalignment, wouldn't the filesystem driver see that the superblock (or whatever signature it uses) is misplaced and refuse to mount?

I have destroyed an ext3 partition due to improper geometry settings for an external usb hard drive.  Something about a computer I plugged it into (bad bios?) caused this.  From the Large Disk HOWTO I learned to manually specify the C,H,S as a kernel parameter sda=24321,255,63 in order to correct the problem.

Good "fdisk -l" output:

	Disk /dev/sda: 200.0 GB, 200049647616 bytes
	255 heads, 63 sectors/track, 24321 cylinders
	Units = cylinders of 16065 * 512 = 8225280 bytes

Bad "fdisk -l" output:

	Disk /dev/sda: 137.4 GB, 137438952960 bytes
	255 heads, 63 sectors/track, 16709 cylinders
	Units = cylinders of 16065 * 512 = 8225280 bytes

Zac
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