Ide Drive Light; Primary Hard Drive - HP Compaq Presario,Presario R4000 Hardware And Software Manual

Drives

IDE Drive Light

When the IDE (Integrated Drive Electronics) light, identified in
the following illustration, is on or blinking, the primary hard drive
or an optical drive is being accessed.

Primary Hard Drive

The primary hard drive, sometimes called the internal hard drive,
is the hard drive inside the hard drive bay.
The hard drive assembly and the hard drive bay should be
accessed only by a service partner.
5–2 Hardware and Software Guide