This screen shot is of 4 OSs all in Logical Volumes (Partitions) in one Extended partition:
Therefore, booting to Windows 7 in a Logical Partition is no problem. However, one issue I see in your layout is that partitions #2 and #4 are separated by Partition #3. This raises the question in my mind as to whether it is possible to create two Extended Volumes (Partitions) on one hard drive?
If all four current partitions are going to be kept, and a fifth partition added, it seems to me that not only would the Windows 7 partition need to be copied into a Logical Volume in an Extended Partition, but you would want to move it so that your two "Primary Partitions" would be Partitions #1 and #2.
Personally, I think I would approach the project by shrinking the Partitions to give #4 the most room. Convert #4 to an Extended/Logical Partition. Create the Windows 7 Logical Partition and copy Windows 7 into the partition. After booting to this Logical Windows 7 Partition, the original can safely be removed, leaving the two remaining Primary Partitions at the front of the hard drive space. Then create the Logical Data Partition.
Some other possibilities also come to mind. Transfer the OEM Recovery partition to DVD and use the space for the Data Partition? Or convert Partition #4 to Extended/Logical and create the Logical Data Partition in the Extended Partition and leave Partitions #1, #2, and #3 as Primary?
I am making an assumption here that new
laptops will have hard drives of sufficient size to make these changes?
Food for thought ...