Gordon wrote:

This page says not:
http://www.pcguide.com/ref/mbsys/bios/compBoot-c.html

From Microsoft's Knowledgebase:

On Intel-based computers, the system BIOS controls the initial operating
system boot process. After the initial Power On Self Test (POST) when
hardware components are initialized, the system BIOS identifies the boot
device. Typically, this is a floppy disk or a hard disk. In the case of the
hard disk, the BIOS reads the first physical sector on the disk, called the
Master Boot Sector, and loads an image of it into memory. The BIOS then
transfers execution to that image of the Master Boot Sector.

From Wikipedia:
A boot sector (sometimes called a bootblock) is a sector of a hard disk,
floppy disk, or similar data storage device that contains code for booting
programs (usually, but not necessarily, operating systems) stored in other
parts of the disk.

I can cite as many sources as you wish, including my own Computer Science
degree courses, indicating that the "boot block" or "boot sector" is on the
disk.
--
Brian Tillman [MVP-Outlook]