The boot manager simply for everyone!  
Product
Order
Support
  Partition numbers
About us

Partition numbers

Within the package Boot-US all partitions on a hard disk are assigned a partition number according to the following rule:

Primary and extended partition are assigned always a partition number between 1 and 4. Logical partitions are assigned always a partition number of 5 and higher.

Within each of the two groups the partitions are ordered according to their position on the hard disk. For example a primary (or extended) partition with the number 1 lies before a partition with the number 2. Similarly a logical partition with the number 5 always lies before a log. partition with the number 6.