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I ended up manually adjusting the size of the extended partition so that it is one more than the end of the last logical partition. I used a different editor and the calculator but followed these linux instructions.

sudo sfdisk -d /dev/sda > temp
sudo vi temp
sudo sh -c "cat temp | sfdisk /dev/sda ...

testdisk and fdisk seem to disagree about the size of my hard drive.

Is there a way I can get reliable information from either some software or from hp?

Thanks. I've attached the entire log as a zip file, and the part that displays the partition table here.

Analyse Disk /dev/sda - 320 GB / 298 GiB - CHS 38913 255 63
Geometry from i386 MBR: head=255 sector=63
NTFS at 0/32/33
NTFS at 25/126/38
NTFS at 30464/69/6
get_geometry_from_list_part_aux head ...

I'm trying to put four operating systems on my laptop and have extended partitions to make room. I've also installed Windows XP which looks like it damaged my filesystem. There are two problems with my filesystem that I wonder if testdisk can fix.

1) The extended partition seems to extend beyond ...