I have a RAID1 with two HDD. both drives are identical, and using 512byte/sector. One of my HDD just died. (I hope it's not the mother board issue) I'm trying to buy the same drive, but the website where I bought them doesn't sell these HDD anymore. I guess I can't put a 4096byte/sector HDD in the RAID along with my 512B/sector drive? I'm using WinXP pro SP2, I'm not even sure it works with 4K drives Edit: I found and bought one with the same Serial (ST2000DL003) on another website. I hope it will be the same.