Event ID 24621 — BitLocker Volume Conversion

Applies To: Windows Server 2008

In BitLocker parlance, the term "conversion" refers to either encrypting or to decrypting an entire volume. Encryption of the entire volume occurs when BitLocker is enabled for that volume. Decryption occurs if an administrator chooses the Decrypt the drive option when turning off BitLocker from the BitLocker Control panel or uses the disable option from the manage-bde command-line tool.

Event Details

Product: Windows Operating System
ID: 24621
Source: Microsoft-Windows-BitLocker-Driver
Version: 6.0
Message: Initial state check: Rolling volume conversion transaction on %2.


Allow the system to retry

While converting a volume from a decrypted to encrypted volume, or vice-versa, BitLocker will automatically resume if the computer enters sleep or hibernation, or if the power is turned off. A user may also manually pause and resume the conversion process. BitLocker will retry pending operations without intervention.


To verify that BitLocker volume conversion has completed successfully, perform the following procedures, as needed.

To perform these procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

If you replaced the disk hardware, you first need to re-enable BitLocker by using the following procedure.

To re-enable BitLocker:

  1. Click Start, and then click Control Panel.
  2. Click Security.
  3. Click BitLocker Drive Encryption.
  4. If the UAC prompt appears, verify the action is what you requested, and then click Continue.
  5. Under the volume to be encrypted, click Turn On BitLocker.

Once BitLocker has been re-enabled (or if you did not replace hardware), continue with the following procedure:

To verify that BitLocker has completed converting the volume:

  1. Click Start.
  2. In the Start Search box, type eventvwr.msc, and then press ENTER.
  3. If the UAC prompt appears, verify the action is what you requested, and then click Continue.
  4. Examine the System log. Once encryption has completed successfully, event 24579 is recorded in the System log under the event source Microsoft-Windows-BitLocker-Driver.

BitLocker Volume Conversion

Core Security