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2.5" SAS hard drive for HP Proliant server

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http://www.linuxquestions.org – I need 5 2.5" SAS hard drive for my server since I have only one double-port HD, I know the size is 2.5", 10K SAS, but those on ebay has a different model number, some are single port, so I have two questions: 1). Can I use single port? or I must buy dual-port? 2). If the HD is dual-port rated at 10K speed, but has a different model number, does that mean I can use that as long as it is 10K? or there are other issues I need to be concerned with? (All my hard drives will be the sam mode, same brand) Many thanks! I got my answer, could someone erase this post? Thanks! (HowTos)