Lenovo laptops come with 4 primary partitions.
I think if you shrink one, you will find yourself suddenly forced into an extended partition the next time you do anything with partitions. Any change in partition tables will likely ruin the usability of the one touch restore to original button. Then you will need to locate and download a rather large engineering dvd just to repair that button and reload the OEM partition to restore its usability. It may look like its empty, but surely isnt. It contains your restore to original image and drivers.