This is a backup server, disk is system disk C, D, E, F disk backup some important information of the three servers, respectively, folders, and each will backup copy or two folders, so data deduplication rates are high, but recently added a piece of hard disk has been have no action , a total of 3 piece of hard disk, four partitions, a piece of hard disk 2 t got the two districts, C, D, two pieces of E and F are 3 t, dish is system disk C, D, E, F is a storage tray is used to store data, originally only C, D, E are no problem, but recently added F plate after the F plate although has enabled the function of data de-duplication, but did not do any deleted, at first thought it was last time is not enough, but set to 24 hours later, still no change, this is I don't know what is going on,