2 TB Hard Drives and RAID 5 in home server

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http://askubuntu.com – I recently converted my home media server from Windows Server 2008 to Ubuntu 11.10. Right now, there is a single WD20EARS 2 TB hard drive formatted as NTFS that's about to run out of space. I'd like to purchase a few extra drives (the case can hold an additional two). I have a few questions before I actually purchase anything though: The original reason I was running Windows Server was because of the way 4k sector drives are handled on Linux. I've since found this guide that might fix it, but I'm also seeing people say that it didn't work. Which 2 TB hard drives have the best compatibility, (HowTos)