manage-bde {-changekey} Volume PathToExternalKeyDirectory {-ComputerName|-cn} ComputerName {-?|/?} {-Help|-h} Description: ...

manage-bde {-changekey} [Volume] PathToExternalKeyDirectory
                          [{-ComputerName|-cn} ComputerName]
                          [{-?|/?}] [{-Help|-h}]

Description:
    Modifies the startup key for a volume protected with a TPM based protector.

Parameter List:
    Volume      A drive letter followed by a colon, a volume GUID path or
                a mounted volume. Example: "C:",
                \\?\Volume{26a21bda-a627-11d7-9931-806e6f6e6963}\ or
                "C:\MountVolume"
    PathToExternalKeyDirectory
                The path to save the new startup key in.
    -ComputerName or -cn
                Runs on another computer. Examples: "ComputerX", "127.0.0.1"
    -? or /?    Displays brief help. Example: "-ParameterSet -?"
    -Help or -h Displays complete help. Example: "-ParameterSet -h"

Examples:
    manage-bde -changekey c: d:\