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Hot swappable hard drive vs hot swappable caddy vs hot swappable controller?

speedkills
in Lounge

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I have some HP servers that need storage upgrades and I simply cannot afford the cost of HP drives right now (they want $500 for a 2TB SATA HDD) and have been looking at just putting consumer drives in there, say Barracuda 2TB drives that still have NCQ for under $200 each.  In the process I noticed that even with SATA drives there are varying models and only the most expensive say they have hot swap support which confused me as I have always been under the impression that it was the controller that gave hot swap support since it is responsible for powering up and initializing the drive (isn't it?). 

 

Can anyone clear up when I need hot swappable drives, trays, and controllers?  Do I need all three?  Does anyone out there have experience replacing HP SATA drives with off the shelf SATA drives?

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