Hi! Needed this for a project of mine and I thought that someone else might need it. UDF: ; #FUNCTION#;=============================================================================== ; ; Name...........: _DriveGetClusterSize ; Description ...: Returns the cluster size of a drive ; Syntax.........: _DriveGetClusterSize([$sDrive=@HomeDrive]) ; Parameters ....: ; Return values .: Success - Cluster size in bytes ; .; Failure - -1 and @error=1 ; Author ........: Andreas Karlsson (monoceres