In my 8 years of serious computing, I have never had to replace a HDD but I am going to have to do it for the first time sometime earlier next week when the new one along with the recovery media from Acer gets here. I have managed to locate a service manual for my Acer Notebook model series here. The new HDD is a WD500BPKT @ 7200RPM The old HDD is a WD3200BEVT-22ZCT0 @ 5400RPM Will I need to install new drivers (SCSI etc.) or anything else, or is it a simple plug-and-play operation once the recovery media is booted off of the disks and installed? I suspect I will need to change the BIOS Boot Order so that the opticle drive is first rather than IDE 0 to get the disks to come up, so that's a non-issue. Also, I know it is the HDD because I have several different indicators (see blog, I put them there for my and other's quick reference. Hope that's OK). Full system specifications are in my "About". Thank you very much!