hardrive maybe

hey all. I've been getting a complete freeze on my system. X is stuck and my keybourd lights flash. I can't even ssh into the box to run top. I'm thinking it is the only ext2 harddrive, it only seems to happen when i'm reading or writting large files from that drive. Now I have everything backed up and am ready to switch out drives but I figured I would check and see if anyone has had a experiance like that and make sure i'm on the right track. My other drive is reiserfs by the way. thanks Caleb