I have 3 hard-drives in one pc, but now Drive C is full and i would like to remove some big files in Drive C to Drive D. I couldn't drag those files to Drive D at all, is there any software i have to use or there is another trick to get those files to DriveD.

If you're running windows then you should be able to just copy or move them over... unless there is something I've never heard about. I guess you could be having troubles with windows or with the way things are hooked up under the hood. Another way is to copy all the files to one directory on drive C (to make it easier), then make a directory on drive D, then boot to DOS... once there, switch to the directory on drive D and type: (Copy C:\XXX\*.*) You must type the "Star, dot, star" thing to grab every file in the directory. Hit enter and let dos do the work... hope this helps.

Use right click when dragging, it may be you are trying to move .exe or other files.

It is so simple by MS-Dos: Suppose you want to move a file named MYFILE.BMP that exist in Directory PICTURES on drive C to dive D in directory PICTURES. Follow the following simple steps: Step 1. Make a directory on drive D i.e PICTURES on root directory. MD d:\pictures [ENTER] it looks like "D:\PICTURES" Step 2. Move to directory on drive C from where you want to move files. c: "C:\" CD PICTURES [ENTER] "C:\PICTURES" Step 3. Apply the following command to MOVE MYFILE.BMP files. MOVE myfile.bmp d:\pictures [ENTER] repeat these steps till you have move all files on drive D May this solve your problem.