Primary vs Logical Partitions?

Lea Gris lea.gris at
Thu Sep 6 20:46:43 UTC 2007

James Taji a écrit :
> On 9/6/07, Scott (angrykeyboarder) <geekboy at> wrote:
>> Despite all my research on this subject, I'm still unclear on some things.
>> If I have my facts straight, you can only have a total of 4 primary
>> partitions.
>> If you've got 2 hard drives you could have one on one and 3 on the other
>> (or two on each) but the end result is the total can't be more than 4.
> The limit of 4 primary partitions is per disk.
>> And if I have this straight, you can also have a drive with *no* primary
>> partition. Said drive would have an extended partition and 4 (or 9....)
>> logical partitions within that.
> Not exactly, an extended partition IS a primary partition. 1 of the 4
> primary partitions can be an extended a partition table

Exactly, and, if you intend on using a whole disk, there is no real need
in adding partitions at all. Just create the filesystem on the root
block device like /dev/hdb instead /dev/hdb1 ... 2 ... 3

Avoiding a partition table wil save a few blocks and will save
boundaries limitations affecting partition start and end.

     Léa Gris -
()   Campagne du ruban texte brut contre les courriels en HTML,
/\   contre les pièces jointes dans un format propriétaire.

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