Valid disk in drive A: ?

Problem/Question/Abstract:

Valid disk in drive A: ?

Answer:

This function returns whether a drive's state = whether it contains

no disk
an unformatted disk
an empty disk
a disk with files


type
  TDriveState = (DSNODISK, DSUNFORMATTEDDISK, DSEMPTYDISK, DSDISK_WITHFILES);

function DriveState(driveletter: Char): TDriveState;
var
  mask: string[6];
  sRec: TSearchRec;
  oldMode: Cardinal;
  retcode: Integer;
begin
  oldMode: = SetErrorMode(SEM_FAILCRITICALERRORS);
  mask := '?:\*.*';
  mask[1] := driveletter;
{$I-}
  retcode := FindFirst(mask, faAnyfile, SRec);
  FindClose(SRec);
{$I+}
  case retcode of
    0: Result := DSDISK_WITHFILES; { at least one file was found  }
    -18: Result := DSEMPTYDISK; { no files, but disk is ok     }
    -21, -3: Result := DSNODISK; { DOS ERRORNOTREADY in WinNT,
    ERRORPATH_NOTFOUND in 3.1  }
  else
    Result := DSUNFORMATTEDDISK; { unformatted disk in drive    }
  end;
  SetErrorMode(oldMode);
end; { DriveState }