I don't know where you got that idea, but it is not correct at all.
When your purchase an upgrade version of Windows, you still have the option
to format the hard drive and install it from scratch with no remnants of the
old OS left behind. The only difference is that you must prove that you
qualify for the upgrade, so during the installation, if it can't find a
previous qualifying OS, it will prompt you to put the original CD into the
CD tray to prove that you did, in fact, purchase an older OS.
This is, in essence, a price break for those who have already purchased a
copy of Windows in the past. It is still the same full Windows XP as the
non upgrade version.
With BOTH versions (upgrade and full retail), you have the option to
"migrate" the old OS to XP or to completely replace the old OS with XP.
What I have just described is not new. It is the way MS has sold "upgrades"
for many years.
Rick said:
**You can do a full install with the Upgrade version. At a certain point,
early in the setup routine, you will need to insert the install CD for a
previous, qualifying version of Windows in order to "justify" the use of the
Upgrade version.**
Not true. That is why they call it upgrade and not full install. You can
see the difference in what you pay for it as well. Your system will carry
forward any defects in the OS with the upgrade. Not so with the full
install.