sorry but I am pretty novice on SSD...
I have a laptop HP Pavilion DV6 1280el with Win7 x64, I know that the hard drive installed is a SATA Hard Drive.
Can I replace it with a SSD SATA ? I saw that there are SSD SATA2 and SSD SATA3 which one can I install on my PC ?
Do you have some suggested models?
Sata II or Sata III should not be a problem, as stated above sata III is backwards compatable.
(1) for most notebook users you will not see much difference in performance between Sata II or Sata III SSDs. The primary difference is in sequencial read/writes which is the least important benchmark for a OS+program drive.
(2) For compatability issues I recommend avoiding the SF22xx SATA III drives (ie OCZ Agility III/vertex III). Recommend: Sata III, the Curcial M4 and for a Sata II drive the Samsung 470 or the intel 320 (the problem with the Intel 320 8mb bug seems to have died down).
Tried to do a search on your laptop to see which chipset it uses (Intel vs AMD). If AMD you will probably get lower than advertized preformance. If Intel, works best if you can use the latest Intel RST driver - ver 10.6