SCSI harddisks are named with sdx, where x is a hardisk letter. The disk with the lowest SCSI ID on the first controller will become sda, the next lower sdb, an so on.
If you have IDE harddisks, they are called hda, hdb, hdc, and so on instead, where hda is the master disk on the first controller, hdb is the slave disk on the first controller, hdc is the master disk on the second controller, and so on.
GNU/Linux systems usually use a partition scheme where a harddisk can have up to four primary partitions. If you want more, you have to make one of these an extended partition where you can make several logical partitions. The partitions are named with the disk they belong to, and a number. The first primary partition on the first SCSI disk is therefore sda1, the second primary partition is sda2, and so on. The first and second logical partition on an extended partition on the first SCSI disk is sda5 and sda6, and so on. If this makes absolutely no sense to you at all, try to read Section 17.
you start cfdisk from the command line with the command
cfdisk /dev/sdx
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cfdisk /dev/sda
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After you have started cfdisk you'll get an interface where the current partition table is listed with the names and some data about each partition, and some command buttons on the bottom of the screen. To change between partitions, use the up and down arrow keys. To change between commands, use the left and right arrow keys.
To delete an existing partition, highlight it with the up and down keys, select the Delete command with the left and right arrow keys, and press Enter.
To make a new partition, select the New command with the left and right arrow keys, and press enter. You'll get the choice between a primary and a logical partition. If you want a logical partition, the program will automatically make an extended partition for you. Then you must choose the size of the partition (in MB). If you can't enter a value in MB, return to the main screen with the Esc key, and select MB with the Units command.
To set the type of a partition, for bootable PReP, Linux swap or Linux ext2, highlight the actual partition, and select the Type command. You'll get a list over different types. Press space, and you'll get even more. Find what type you need, and enter the number at the prompt.
To be able to boot from a primary partition, you need to make it bootable. Highlight the actual partition and select the Bootable command.
When you are content 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. You should therefore be very sure that you want to do this before actually press the Return key.
To exit the program, select the Quit command.