Originally Posted by linuxlover.chaitanya
If you want, you can allow Ubuntu to partition your disk. But if you have some partitioning that you want to do then you can do it manually. If you want to use the complete disk for Ubuntu then you can allow it partition it. Else its better you do it yourself manually.
I would also strongly recommend (if you are confident enough to partition manually) making a seperate /home partition, as well as the standard / partition (root). If you are using the entire disk, make a 20-30GB root partition, just incase you decide to install the world on your HDD, among other things as root can fill up quite quickly, and give the rest to /home.
In addition to this, if you are using ubuntu 9.04/9.10, use the ext4 filesystem as this is a LOT faster than ext3.