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Windows Vista Security: Praxisorientierte Sicherheit für Profis by Marcus Nasarek

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Managing the BCD Data Store
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If you want to use a pre-Windows Vista operating system as the default, you’d use
the identifier for the Windows Legacy OS Loader. The related BCD entry looks like
this:
Windows Legacy OS Loader
------------------------
identifier {466f5a88-0af2-4f76-9038-095b170dc21c}
device partition=C:
path \ntldr
description Legacy (pre-Longhorn) Microsoft Windows Operating System
Following this, you could set Ntldr as the default by entering:
bcdedit /default {466f5a88-0af2-4f76-9038-095b170dc21c}
Changing the Default Timeout
You can change the timeout value associated with the default operating system using
the
/timeout parameter. Set the /timeout parameter to the desired wait time in sec-
onds, such as:
bcdedit /timeout 30
If you set the timeout to zero seconds, the system will boot automatically to the
default operating system.
Enabling Physical Address Expansion
Physical Address Expansion (PAE) is a feature that allows x86-based computers to
support more than 4 GB of physical memory, effectively expanding the number of
addressable bits from 32 to 36. Physical memory in addresses above the first 32 bits
is accessed as regular 4 KB memory pages.
If you want to enable PAE through the BCD, you can use the command syntax:
bcdedit /set bootldrid pae paeState
where bootldrid is the identifier for the operating system that should use PAE and
paeState specifies how you want PAE to be used:
Default
If you set paeState to Default, the operating system will use the default configu-
ration for PAE.
ForceEnable
If you set paeState to ForceEnable, the operating system will use PAE.
ForceDisable
If you set paeState to ForceDisable, the operating system will not use PAE.

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