How much disk space used where? On the CD? Leave it in the drive and right click and choose "properties". This will give you the details you want.
If you use a CD-RW you can copy files to disk a number of times, or if you have a CD-R, choose the "multisession" option.
To move files from CD to hard disk, simply select them all and drag to the relevant folder on the hdd. CTRL-A will select them all, CTRL-C will copy them, and CTRL-V will paste into the new folder.