error in partition table leaves some space inaccessible



My partition table has gotten damaged. Specifically, the extended partition has an incorrect ending cylinder, which leaves some unused disk space inaccessible.

My disk started out with a Vista partition at the beginning and a recovery partition at the end, so as fdisk says, "Partition table entries are not in disk order". I have added a Grub boot partition and the extended partition. The extended partition contains three Linux partitions, a swap partition, and a VFAT partition.

According to fdisk (and Vista disk management agrees), the extended partition ends at cylinder 11278 and the recovery partition begins at cylinder 13638. I didn't notice this until I tried to create another partition, so I don't know how long this error has been there. There's 19G unused on my disk. I already have four primary partitions, and the extended partition says it doesn't include the unused area.

Is there a way to correct the end point on the extended partition in my partition table so that this area can be used to create additional partitions?

Thanks,
Allan

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