Clear-Tpm
Resets a TPM to its default state.
Syntax
Clear-Tpm
[[-OwnerAuthorization] <String>]
[<CommonParameters>]
Clear-Tpm
-File <String>
[<CommonParameters>]
Description
The Clear-Tpm cmdlet resets the Trusted Platform Module (TPM) to its default state. A reset removes the owner authorization value and any keys stored in the TPM. To reset a TPM, you must provide a valid owner authorization value. You can enter an owner authorization value or specify a file that contains the value. If you do not provide a value, the cmdlet attempts to use a value stored in the registry.
For more information on TPM, see the Trusted Platform Module Technology Overview in the TechNet library.
Examples
Example 1: Reset TPM
PS C:\> Clear-Tpm
TpmReady : False
TpmPresent : True
ManagedAuthLevel : Full
OwnerAuth :
OwnerClearDisabled : True
AutoProvisioning : Disabled
LockedOut : False
SelfTest : {191, 191, 245, 191...}
This command resets the TPM. The command uses the owner authorization value stored in the registry instead of specifying a value or using a value in a file.
Example 2: Reset TPM with a supplied authorization value
PS C:\> Clear-Tpm -OwnerAuthorization "vjnuW6rToM41os3xxEpjLdIW2gA="
TpmReady : False
TpmPresent : True
ManagedAuthLevel : Full
OwnerAuth :
OwnerClearDisabled : True
AutoProvisioning : Disabled
LockedOut : False
SelfTest : {191, 191, 245, 191...}
This command resets the TPM by using the specified owner authorization value.
Example 3: Reset TPM using authorization value from file
PS C:\> Clear-Tpm -File "MyOwnerAuthFile.tpm"
TpmReady : False
TpmPresent : True
ManagedAuthLevel : Full
OwnerAuth :
OwnerClearDisabled : True
AutoProvisioning : Disabled
LockedOut : False
SelfTest : {191, 191, 245, 191...}
This command resets the TPM by using the owner authorization value included in the specified file.
Parameters
-File
Specifies a file that contains the current owner authorization value for the TPM. You can use the TPM Management Console to create this file.
Type: | String |
Position: | Named |
Default value: | None |
Required: | True |
Accept pipeline input: | False |
Accept wildcard characters: | False |
-OwnerAuthorization
Specifies the current owner authorization value for the TPM.
Type: | String |
Aliases: | o |
Position: | 1 |
Default value: | None |
Required: | False |
Accept pipeline input: | True |
Accept wildcard characters: | False |
Inputs
String
This cmdlet accepts the owner authorization value for the TPM.
Outputs
TpmObject
This cmdlet returns a TpmObject object contains the following information:
- TpmReady. Whether a TPM complies with Windows Server® 2012 standards.
- TpmPresent. Whether there is a TPM on the current computer.
- ManagedAuthLevel. The level at which the operating system manages the owner authorization. Possible values are Legacy, Balanced, and Full.
- OwnerClearDisabled. Whether TPM can be reset. If this value is True, the TPM cannot be reset through the operating system by using the owner authorization value. If this value is False, the TPM can be reset through the operating system.
- AutoProvisioning. Whether the computer can use auto-provisioning. Possible values are NotDefined, Enabled, Disabled, and DisabledForNextBoot.
- LockedOut. Whether a TPM is locked out.
- SelfTest. Information returned by a test that TPM runs.
Related Links
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