[Syncing fragments hard drive, badly]

I've noticed BitTorrent Sync appears to fragment my hard drive pretty badly.

Setup:

• 2 Laptops (Laptop A and Laptop B), both with 500 GB hard-disk (5400 RPM disk)
• Laptop A has Windows 7, various programs, and 4 30+ GB folders (each with 10,000+ files)
• Laptop B has Windows 7, few programs, and few files

Steps to reproduce:

• Step 1) Defragment both Laptops A & B
• Step 2) Sync 1 30+ GB folder from Laptop A to Laptop B
• Step 3) Check fragmentation of Laptop B.
• It is now over 10%
• If you repeat steps 2 & 3, then the fragmentation is over 20%.

 

Any ideas on what can be done to prevent this fragmentation?

Thanks!