Start cfdisk

You start cfdisk from the command line with command
cfdisk / dev / sdx
where x is the SCSI hardisk letter, like a, b, c, d, etc. So if I want to partition the first hard drive on the SCSI controller, I would enter the command
cfdisk / dev / sda
How to use cfdisk
A. User interface
Once you have started cfdisk you'll get an interface where the partition table is currently listed with names and some data about each partition, and a command button at the bottom of the screen. To switch between the partitions, use the up and down arrow keys. To switch between the command, use the arrow keys left and right.
2. Deleting a partition
To remove an existing partition, highlight it with the up and down, select the Delete command to the left and right arrow keys, and press Enter.
3. Creating a new partition
To create a new partition, select the New command to the left and right arrow keys, and press enter. You will get a choice between primary and logical partitions. If you want a logical partition, the program will automatically create the extended partition for you. Then you must choose the partition size (in MB). If you can not enter a value in MB, return to the main screen with the Esc key, and select MB with the Units command.
4. Set the partition type
To set the type of partition, for bootable PReP, Linux swap or Linux ext2, highlight the actual partition, and select the command type. You will get a list of more than a different kind. Press space, and you'll get even more. Find what type you need, and enter the number at the prompt.
5. Make the partition bootable
To be able to boot from primary partitions, you need to make it bootable. Highlight the actual partition and select the Bootable command.
6. Writes the result to disk and exit
When you are satisfied with the layout of the disk, select the Write command. The partition table will be written to disk. Remember that this will destroy all data on partitions you have deleted or changed. Therefore you must be very sure that you want to do this before you actually press the Return key.