OK, that explains it all - thanks for the follow-up. Just as an update, the two hard drives came in from NewEgg.........one was DOA! d:~[ I ordered the replacement today and they agreed to send it overnight at their cost. Regards, Bob - "The Keyboard Cowboy" Cincinnati, OH Scottsdale, AZ Sunday, February 25, 2007 10:31:14 PM --==<<0>>==-- On Sunday, February 25, 2007, 8:29:14 PM, you wrote: G> Hi Bob, G> Both WinXP Home & Pro are designed to recognize up to 4GB of RAM. WinXP G> Pro X64 will recognize up to 128GB, but good luck finding a mainboard G> that'll hold that much. lol G> The /3GB switch for Boot.ini is to tell Windows to reserve the lower 3GB G> for programs and such (user mode processes). The Windows kernel mode G> processes will then all load above 3GB. The details are available at the G> link below, but it can only be used when more than 3GB of RAM is loaded. G> http://msdn2.microsoft.com/en-us/library/ms791558.aspx G> Peace, G> GMan G> "The only dumb questions are the ones that are never asked!" G> ----- Original Message ----- G> From: "Bob - "The Keyboard Cowboy"" <KBCowboy@xxxxxxxxx> G> To: "GMan" <pctechtalk@xxxxxxxxxxxxx> G> Sent: Sunday, February 25, 2007 2:39 PM G> Subject: -=PCTechTalk=- Re: RAM question >>I guess I'll buy that, though it leaves me a bit confused. Here's what I >>know to be fact.....I have WinXP Pro on a computer and I have four Gig of >>RAM that Win XP recognizes. Based on the articles I saw it was because of >>the difference between Win XP Home and Win XP Pro. Maybe I had the 64 bit >>loaded from the start? Who knows, it came from Dell this way <G> >> Regards, >> Bob - "The Keyboard Cowboy" G> -- G> <Please delete this line and everything below.> G> To unsub or change your email settings: G> //www.freelists.org/webpage/pctechtalk G> To access our Archives: G> http://groups.yahoo.com/group/PCTechTalk/messages/ G> //www.freelists.org/archives/pctechtalk/ -- <Please delete this line and everything below.> To unsub or change your email settings: //www.freelists.org/webpage/pctechtalk To access our Archives: http://groups.yahoo.com/group/PCTechTalk/messages/ //www.freelists.org/archives/pctechtalk/