Event ID 24595 — BitLocker Volume Conversion

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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: 24595
Source: Microsoft-Windows-BitLocker-Driver
Version: 6.0
Symbolic Name: FVE_CONV_BAD_CLUSTERS_SKIPPED
Message: Volume %2 contains bad clusters. These clusters will be skipped during conversion.

Resolve

Run the chkdsk tool on the BitLocker-enabled volume

BitLocker Drive Encryption cannot work correctly if the computer hardware is malfunctioning or the disk contains excessive bad sectors or logical errors. To correct this situation, use the chkdsk tool to check and repair a disk, or replace any malfunctioning hardware.

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

To use the chkdsk tool to check and repair a disk:

  1. Click Start.
  2. Type cmd in the Start Search box.
  3. Right-click cmd.exe in the Programs section of the search results.
  4. Click Run as administrator.
  5. If the User Account Control prompt appears, verify the displayed action is what you requested, and then click Continue.
  6. At the elevated command prompt, type chkdsk c: /R where c: is the drive being encrypted.

If chkdsk is unable to repair the problems, contact your hardware vendor or hardware maintenance organization for assistance.

Verify

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