[CentOS] resize2fs

Hi All:

I am trying to resize a centos (5.2) VM drive. I use VMware and I have increased the size of the drive by 40G. I am running resize2fs on /dev/sdb1 (which is my root partition) but when I do I get this error:

[root@centos ~]# resize2fs /dev/sdb1 120G resize2fs 1.39 (29-May-2006) The containing partition (or device) is only 19970795 (4k) blocks. You requested a new size of 31457280 blocks.

How can I change the block size?

I have also tried to use gparted live cd but it will not allow me to increase the size even though it sees 40g of unused space. I can only create a new partition.

Any help would be appreciated.

Thanks, Ed