Thanks for reading my thread. Computer I have now is a 500g iMac 11, 2 I had a seagate 1T external HD and my iMac HD kept getting corrupt so I had to repair it then it was fine except it kept happening over and over. I thought it was my computer (which was a referb) so i got that replaced with a brand new one (not a referb) and it still happened. Finally i disconnect the external HD and it stopped....until... I installed black berry desk top manager and was using it to back up my phone on the iMac. Same thing happened with the seagate...same solution, I installed the software. My question is this... why won't my mac work with anything? Is there any blackberry users out there who have had success with the blackberry software on a mac? Also, anyone else have problems with seagate? what can i do. What external should I buy? Also, I'm planning on upping the ram in my machine from 4 to 12 by filling the other 2 slots with OWC 4g ram. Anyone have any thoughts on that? Will my iMac reject the OWC ram like it did anyother third party stuff? The only 3rd party thing my iMac has worked well with are my bose speakers... Thanks for any help in advance!