Extended - logical partitions - free sectors unusable

[Fajar Priyanto]

Hello,
I have been observing this phenomena several times.
When we do partitioning during install, I notice that if we make an extended 
partition and create 1-2 logical partitions in them, the "unused" space is no 
longer usable after install.

For example:
80GB is divided into:
sda1	10GB	mounted on /
sda2	2GB	swap
sda3	30GB	mounted on /home
sda4	48GB	extended partition
sda5	10GB	mounted on /data

Although there's still 38GB left unused, I cannot make another logical 
partition using fdisk. It says the sectors are unusable. I have to delete 
sda5 and sda4, create the extended partition and recreate the logical 
partitions.

Is there a reason for this?
Any clues are appreciated.
-- 
Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial 
http://linux2.arinet.org
08:19:34 up 38 min, 2.6.22-14-generic GNU/Linux 
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