If all of these partitions are reserved for BT3 I really can't see the reason to divide them over three different logical partitions as one would suffice quite nicely.sda5: Boot (Logical Part)
sda6: Swap (Logical Part)
sda7: Root (Logical Part)
If I on the other hand completely misunderstood your question and you are asking if you should get rid of all other partitions you have and install BT3 on a sole primary one there should be no need for that as long as you use a bootloader, lilo for example.




