You really need me to tell you why you need reboot PC after compressing the .mdf ?, I will give you a hint (1) look at your HDD space left before you extract the rar, (2) then look at HDD space after you extract the rar, (3) then look at HDD space after you compress the .mdf, (4) then finally look at HDD space after you reboot PC, come back and tell me what doesnt change from stage 2 till after stage 4.
P.S I would simply have replied with the answer to your question, if i didnt detect a slight smartass attitude, you werent really asking for real IMO.
