disk partitioning question

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Author: Dazed_75
Date:  
To: Main PLUG discussion list
Subject: disk partitioning question
This machine has an 80 GB drive. It originally had M$ XP Pro on it. I then
installed a prior version of ubuntu (it has been upgraded a time or two) but
still left some unpartitioned space on the drive.. Somewhere along the line
I started playing with Linux from scratch and added a 5GB partition for it.
I just used cfdisk to look at the drive and got the following:

                                       cfdisk 2.12r

>
>                                    Disk Drive: /dev/sda
>                              Size: 80026361856 bytes, 80.0 GB
>                    Heads: 255   Sectors per Track: 63   Cylinders: 9729

>
>     Name          Flags       Part Type   FS Type
> [Label]          Size (MB)

>
>  ----------------------------------------------------------------------------------------
>     sda1          Boot         Primary    NTFS
> []                31108.01
>     sda2                       Primary    Linux ext3
> [/]               17116.81
>     sda5                       Logical    Linux swap /
> Solaris                  3002.23
>     sda4                       Primary    Linux
> ext2                            5000.98

>
> Unusable                             23795.74

>
>

Any idea why that last 24 GB is showing as unusable? I seem to recall that
a drive can only have 4 primary partitions but am not sure that is true.
Even if it is, there are only 3 shown as primary. Maybe the Logical
partition counts as one of the 4 but can contain multiple "partitions"
within it?

--
The nice part about being a pessimist is that you are constantly being
either proven right or pleasantly surprised.
- George F. Will
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