How to purge dedup storage

Dear All, 

I have configured a dedup disk storage in my local server, and I soon find it running out of disk space. Now i wanted to purge it and relocate the disk to another local disk drive with larger capacity. 

i have delete all the Backup sets created during the full backup job , but when I check the physical disk the disk is still full ... which mean it is still occupying the disk space. 

I did some digging in the dedup folder .... i find alots of system folder to faciliate the dedup ops ... so i am not too sure which folder can i delete ... if it can be deleted. :) please help.

Sincerely ... 

Goh