Installing Windows XP – 3: Press F6
The screen is switching to the blue so-called "Text Mode" part of the
Windows XP installation.
Shortly after that the prompt for "adding additional mass storage (HDD)
drivers" appears at the bottom of the screen.
Press the F6 key to add the AHCI driver to your Windows installation.
How to Install Windows XP on a Satellite L40 Non-OS Model - Page 20