Posted by Stewie The raptor isn't worth it. You'll be happy with the 7200.11. They're really good drives.
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I have a RAID 0 array with three Seagate 160 GB SATA HDs that I use for data that's been online for 2+ years with no problems.
Seagates are quiet, cool running, fast HDs. I like them.
The Samsung Spinpoint is the highest rated HD currently.
The Raptor 1500 is what it is. For a single disk OS you will see faster random reads and writes, but not necessarily better overall performance.
For a RAID 0 arrays it rocks; it's a cool running, reliable HD as best I can tell (get the version with no window).
I'm running a strip array with 4 of them for my OS.
I had a 4 disk Hitachi RAID 0 too. It may have been faster.
That said, on most mobo based controllers you will get a very fast array with 4 good SATA HDs of most that are out there. You don't need Raptors.
One big thing you can do to make the system more reliable, faster, and easier to manage is to have separate drives for your OS and data. Getting the data off the OS drive is one less headache when the OS crashes.
A separate HD for the page file or the PS scratch disk can help too.
If I had two HDs I would use one for the OS and the other for data rather than making a RAID 0 array with them as your doing.
Experiment, as results vary due to equipment, needs and settings. There is no "right" way; each has advantages and disadvantages.
I won't go too nuts; you should see a nice system improvement with the Seagate.
Back up all important data daily and keep off line. As you acquire old HDs that are still good, use them for back up storage. Protect them at all times from ESD so as not to blow out the interface circuity.
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Expect failures...