Dual boot iMac and Win 7 - Defraggler for the Mac side?

When I'm booted in Win 7, and open Defraggler, at the top it shows which drives are available for defragging, including the Mac side "Macintosh HD" (E:). Would it be safe to use Defraggler on that...?

(L)SD

Dallas, Tx

Post-2011 iMac's use Solid State Drives. Do not defrag a solid state drive.