[lfs-support] help, i hosed my windows partition

tilmanbregler tilmanbregler at gmail.com
Sun Mar 10 01:33:39 PST 2013


Hi,

so this is a bit emberassing, and I appreciate if you say this is
nothing to do with you. I have this dual boot Ubuntu 12.04/Windows 7
setup. And to make room for th LFS partitions i decided to shrink the
Windows 7 partition.

So, I read around a bit and got a bit confused by all the tools out
there for working with partitions, but in the end I decided to go with
partman, as it supposedly was going to do the resizing of the ntfs
file system and of the partition in one go. Alas, partman bummed out
half-way through and after that wouldn't start up, anymore.

So, I thought i'd do it the hard way and re-size the file system and
partition separately. I used ntfs2resize to re-size the file system
and that went swimmingly. I then wanted to shrink the partition to
match the file system and this is where things went wrong. None of the
tools I looked at seemed to shrink a partition, but i found some
instructions that said i should delete the partition and re-create it
starting at the same offset, but with the new, smaller size.

So that's what I did. I deleted the partition using fdisk. Only after
deleting the partition, it wouldn't let me create a new one at the
exact same offset, as before. It now says the extended partition
starts where the ntfs partition used to start and will only let me
create a new partition a few sectors after where it originally was. I
tried various tools (fdisk, sfdisk, cfdisk, dparted, gparted), but
none let me do what i wanted easily, and so i chickened out and
thought i'd ask for help. Unsurprisingly, I can no longer boot into
Windows, now. Any help would be much appreciated. This is how my
partition table looks, atm:

 sudo fdisk -l

Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x05b005af

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT
/dev/sda3 206848 1465147391 732470272 5 Extended
/dev/sda5 1024004096 1449783295 212889600 83 Linux
/dev/sda6 1449785344 1465147391 7681024 82 Linux swap / Solaris

Ideally, i'd like to create the ntfs partition starting at sector
206848. Any ideas how i can do that, or get back my windows partition,
otherwise?

Thanks in advance,

Tilman



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