Das bietet mal die lieben Windows-
API:
function GetVolumeInformation (lpRootPathName : PChar; lpVolumeNameBuffer : PChar; nVolumeNameSize : Integer; var lpVolumeSerialNumber : Integer; var lpMaximumComponentLength : Integer; var lpFileSystemFlags : Integer; lpFileSystemNameBuffer : PChar; nFileSystemNameSize : Integer) : Integer; stdcall; external 'kernel32' name 'GetVolumeInformationA'
function GetVolumeNameForVolumeMountPoint (lpszVolumeMountPoint : PChar; lpszVolumeName : PChar; cchBufferLength : Integer) : Integer; stdcall; external 'kernel32' name 'GetVolumeNameForVolumeMountPointA'
function GetVolumePathName (lpszFileName : PChar; lpszVolumePathName : PChar; cchBufferLength : Integer) : Integer; stdcall; external 'kernel32' name 'GetVolumePathNameA'