Originally posted by acid_kewpie
there is no hda4 as hda4 is the extended partition itself, containing hte logical partitions hda5 to whatever....
Actually in his case its /dev/hda3 that is the extended partition.
You can create up to 4 primary partitions. Say for instance:
10 GB drive.
Create a primary of 1 GB, it would be /dev/hda1
Create a logical partition after the primary, its going to use /dev/hda2 as the extended and the actual first logical partition would be /dev/hda5 and so on for any others created as logicals.
Or lets say I create two primary partitions of 1 GB each. They would be /dev/hda1 and /dev/hda2. Then I create a logical partition of the rest of the drive. Then /dev/hda3 would be the extended partition where the first logical partition /dev/hda5 would reside. /dev/hda4 would be unused as you didn't create a third primary to use /dev/hda4 as the extended.
Hope that kind of helps you understand where the number scheme comes from or possibly confuse you anymore.