2 questions on Defraggler operations

Defraggler
1

Can someone explain why in my drive map(s) when using Defraggler that the map shows a whole lot of "free space" between blocks of defragged data as in defrag_blocks.jpg ??

and, why is "enable shell extensions" greyed out on my options/advanced panel as in defrag-options.jpg ?

Defraggler v2.08.373 (64-bit)

Thanks...TRinAZ

post-40776-0-69945500-1326040266_thumb.jpg

post-40776-0-77975100-1326040364_thumb.jpg

2

the answer to the second one is: portable version and/or setting the program to save settings in ini file will grey out the shell extensions setting as will (I believe) not running as admin.