He guys, Im having problems with adding new harddrive's.Because that causes the old ones to not get detected anymore. this problem happend to me twice when i tried to add a secondary hard drive , first time it happend it tought, i had destroyed a new hard drive (wich was a samsung spinpoint f3 500gb) both hard drives i got are sata, so i just connect them with 2 sata cables to the motherboard (wich is a asrock p55 pro) and afcourse 2 power supply cables to te drives. from here its al good. but here's where it go's wrong. after adding the empty new drive to the pc and starting it up, it only finds the new 1 and the old 1 with windows 7 on it is just gone all of a sudden. so i had to install windows 7 on the new 1 rebooted.... and got into windows and still no sign of the old drive wich all my programms were on. so next thing i tried was to just get the new 1 out and boot the pc with only the old 1 in. this didnt help i just got a black screen asking me to insert boot device. this is really driving me crazy since it costed me 2 hard drives already :/ and i dont know what's the problem , i only know that the hard drives aint broken. i hope you guys know wat the problem could be , i've been googling my *** off but didnt find any problems such as this 1.