Several varieties of partitioning programs have been adapted by Debian developers to work on various types of hard disks and computer architectures. Following is a list of the program(s) applicable for your architecture.
Recommended partitioning tool in Debian. This Swiss army knife can also resize partitions, create filesystems and assign them to the mountpoints.
The original Linux disk partitioner, good for gurus.
Be careful if you have existing FreeBSD partitions on your machine. The installation kernels include support for these partitions, but the way that fdisk represents them (or not) can make the device names differ. See the Linux+FreeBSD HOWTO.
A simple-to-use, full-screen disk partitioner for the rest of us.
Note that cfdisk doesn't understand FreeBSD partitions at all, and, again, device names may differ as a result.
One of these programs will be run by default when you select(or similar). It may be possible to use a different partitioning tool from the command line on VT2, but this is not recommended.
SGI machines require an SGI disk label in order to make the system bootable from hard disk. It can be created in the fdisk expert menu. The thereby created volume header (partition number 9) should be at least 3MB large. If the volume header created is too small, you can simply delete partition number 9 and re-add it with a different size. Note that the volume header must start at sector 0.