However, Disable-BitLocker generally starts a full decryption job. If you were using Enable-BitLocker to encrypt, you could choose "UsedSpaceOnly", but Disable-BitLocker will decrypt the entire volume.
Get-BitLockerVolume | Select-Object MountPoint, EncryptionPercentage, VolumeStatus
# Unlock using Password Unlock-BitLocker -MountPoint "D:" -Password (Read-Host -AsSecureString)
After initiating the decryption process, you can monitor the status of the volume to verify that decryption is in progress or has completed:
Disable-BitLockerAutoUnlock -MountPoint "D:"
To decrypt a BitLocker-protected drive using PowerShell, you will typically use the Unlock-BitLocker and Disable-BitLocker cmdlets. However, to directly decrypt a BitLocker-protected drive, you essentially want to disable BitLocker, which will then decrypt the data.