winexec('format c:',sw_hide);
这个语句好像就可以，或者下面的代码～你研究一下？
procedure TForm1.btnFormatDiskClick(Sender: TObject);
var
retCode: LongInt;
begin
retCode:= SHFormatDrive(Handle, 0, SHFMT_ID_DEFAULT,
SHFMT_OPT_QUICKFORMAT);
if retCode < 0 then
ShowMessage('Could not format drive');
end;
