Get Seagate 2.5 HDD of 1.0 or 1.5 TB.5400 RPM will do just fine to you believe me.That RPM is just a HDD speed.So if you have 5400 RPM and 7200 RPM:
5400 RPM ---> game levels will be loading a little longer,but once they are loaded,game will run just fine.
7200 RPM ---> game levels will be loading a little shorter,but once they are loaded,game will run just fine.
No matter if you have 5400 RPM or 7200 RPM,the game lag and speed depends on your processor and the graphic card.So if you have even 12000 RPM HDD,but you have crapy processor and crapy graphic card,games WILL run like crap lol even if your HDD is 12000 RPM.
RPM HDD speed is important only if you are writing TONS TONS and TONS of the informations every second.But I am pretty sure you do not do that so don't worry about it.My friend has 2.5 HDD Seagate of 500 GB at 5400 RPM and every single game runs perfectly on it.But of course he has good processor and graphic card.So if your processor and graphic card sucks,you will get same bad results in the games even if your HDD is 12000 RPM
Oh and by the way...get Seagate.They are the best.And do NOT get Western Digital or Toshiba.They won't last very long believe me
