hello, i was transferring films to my nas hdd's when it started beeping at me. and when i went to go investigate it said i had used all the 2tb space in hdd 1. i have a qnap ts 419p+ with two 2tb samsung hdd's in bay 1 and bay 2. eventually i will have bay 3 and 4 filled with the same hdd's. what i wanted was for basically all 4 hdd's to act as one big hdd where i could access all the films on my mede8er through one folder on the videowall. however 2 things. someone said i could do this but if one hdd died i would lose all and if i did want to do it i would have to do it with all 4 hdd's in place and start from the begining so i would have to back up my first hdd. can anyone help