Toshiba Satellite 1700 Series, Maintenance Manual

Page: 55 / 156

1 Hardware Overview 1.19 Core BIOS Features
Satellite 1700 Series Maintenance Manual 1-41
1.19 Core BIOS Features
1.19.1 Enhanced IDE Disk Drive Support (EDD)
In addition to AT standard disk drive support, the Phoenix Note BIOS 4.06 also supports:
(a) Auto-detection and sizing of all IDE drives
(b) Logical Block Addressing
(c) Fast DMA support
(d) Ultra DMA/33 support
1.19.2 Multi Boot
The notebook can support Multi-Boot for selecting the boot sequence of the hard disk,
floppy, and CD-ROM in Setup.
1.19.3 Quiet Boot
Quiet Boot replaces the customary technical messages during POST with a more visually
pleasing and comfortable display (OEM screen). During POST, right after the VGA
initialization, the notebook displays an illustration called the OEM screen during system boot
instead of the traditional POST screen that displays the normal diagnostic messages.
The OEM screen stays up until just before the operating system loads unless:
(a) You press Esc to switch to the POST screen and the boot process will
continue until the end of POST.
(b) You press F2 to enter Setup.
(c) POST detects a non-terminal error, then it switches to the POST screen near
the end of POST, just prior to prompting for a password.
(d) The BIOS or an optional ROM requests keyboard input, the system switches
over to the POST screen with prompts for entering the information. POST
continues from there with the regular POST screen.
1.19.4 Boot Block
The Flash ROM used in many systems today offers the customer the advantage of
electronically reprogramming the BIOS without physically replacing the BIOS ROM. This
advantage, however, does create a possible hazard: power failures or fluctuations that occur
during updating the Flash ROM can damage the BIOS code, making the system unbootable.
To prevent this possible hazard, many Flash ROM include a special non-volatile region that
can never be erased. This region, called the boot block, contains a fail-safe recovery routine.
If the boot block finds corrupted BIOS, it prompts the end user to insert a diskette, from