3Com e-PC c10/s10, User Manual

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4 4 0 0 C C h h a a p p t t e e r r 5 5
IGURE REATING PRE BOOT IMAGES
The Windows-based Boot Image Editor contains a feature that you can use to create boot
image files with Pre-OS capabilities. To use this feature, select the Pre-OS checkbox in the
Options area of the appropriate Create Image File dialog box. The Boot Image Editor utility is
included with MBA. To install Boot Image Editor, see “
Boot Image Editor Installation ” in
Chapter 2 “Installing MBA.”
Another tool, PBOOT.EXE, is always used as the last file in the Pre-OS AUTOEXEC.BAT file.
PBOOT can be used to terminate (soft Ctrl+Alt+Del) the Pre-OS environment and continue
booting the PC using the operating system resident on the drive C: active partition. Also,
PBOOT can be used to reboot the PC or, if the PC’s BIOS supports Advanced Power
Management (APM), it can shut down the PC - which is useful if the PC was started using
remote wake-up.
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Pre-OS Boot Image is based on a DOS boot disk. Within the Pre-OS environment you may
load memory managers, network drivers, virus checkers, backup routines, software updating
agents and other executables. You may also map network resources and execute any of this
software from the network.
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O O T T E E :
: When loading HIMEM.SYS, be sure to specify the /TESTMEM:OFF
parameter, otherwise the boot image RAM drive in extended memory may
become corrupted.
Pre-OS executables may be loaded and executed from the boot image (mapped to A: drive
during boot), or they may be executed in place from a network drive, or a combination of the
two. Executables loaded from drive A: have read/write access but have limited disk space
available for the boot image. Executables loaded from the network usually have only read
access but have no size restrictions for disk space.
To terminate the Pre-OS image and directly boot another OS from the hard drive, the PBOOT
command must be the last command in the AUTOEXEC.BAT file executing within the boot
image.