Adversaries may directly access a volume to bypass file access controls and file system monitoring. Windows allows programs to have direct access to logical volumes. Programs with direct access may read and write files directly from the drive by analyzing file system data structures. This technique bypasses Windows file access controls as well as file system monitoring tools. 
Utilities, such as NinjaCopy, exist to perform these actions in PowerShell. 
This type of attack technique cannot be easily mitigated with preventive controls since it is based on the abuse of system features.
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Monitor executed commands and arguments that could be taken to copy files from the logical drive and evade common file system protections. Since this technique may also be used through PowerShell, additional logging of PowerShell scripts is recommended.
Monitor handle opens on volumes that are made by processes to determine when they may be directly collecting data from logical drives.