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Syntax
bdehdcfg -target {default|unallocated|<drive_letter> shrink|<drive_letter> merge} -newdriveletter <drive_letter>
Parameters
Parameter
Description
<drive_letter>
Defines the drive letter that will be assigned to the specified target drive.
<drive_letter>
Examples
To assign the default drive the drive letter P:
P
bdehdcfg -target default -newdriveletter P:
bdehdcfg: quiet
Informs the bdehdcfg command-line tool that all actions and errors are not to be displayed in the command-line interface. Any Yes/No (Y/N) prompts displayed during the drive preparation will assume a "Yes" answer. To view any error that occurred during drive preparation, review the system event log under the Microsoft-Windows-BitLocker-DrivePreparationTool event provider.
Syntax
bdehdcfg -target {default|unallocated|<drive_letter> shrink|<drive_letter> merge} -quiet
Parameters
This command has no additional parameters.
Examples
To use the quiet command:
bdehdcfg -target default -quiet
bdehdcfg: restart
Informs the bdehdcfg command-line tool that the computer should be restarted after the drive preparation has concluded. If other users are logged on to the computer and the quiet command is not specified, a prompt appears to confirm that the computer should be restarted.
Syntax
bdehdcfg -target {default|unallocated|<drive_letter> shrink|<drive_letter> merge} -restart
Parameters
This command has no additional parameters.
Examples
To use the restart command:
bdehdcfg -target default -restart
bdehdcfg: size
Specifies the size of the system partition when a new system drive is being created. If you do not specify a size, the tool will use the default value of 300 MB. The minimum size of the system drive is 100 MB. If you will store system recovery or other system tools on the system partition, you should increase the size accordingly.
Note
The size command cannot be combined with the target <drive_letter> merge command.
target <drive_letter> merge
Syntax
bdehdcfg -target {default|unallocated|<drive_letter> shrink} -size <size_in_mb>
Parameters
Parameter
Description
<size_in_mb>
Indicates the number of megabytes (MB) to use for the new partition.
<size_in_mb>
Examples
To allocate 500 MB to the default system drive:
bdehdcfg -target default -size 500
bdehdcfg: target
Prepares a partition for use as a system drive by BitLocker and Windows Recovery. By default, this partition is created without a drive letter.
Syntax
bdehdcfg -target {default|unallocated|<drive_letter> shrink|<drive_letter> merge}
Parameters
Parameter
Description
default
Indicates that the command-line tool will follow the same process as the BitLocker setup wizard.
unallocated
Creates the system partition out of the unallocated space available on the disk.