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const
  FILE_ANY_ACCESS     = 0;
  {$EXTERNALSYM FILE_ANY_ACCESS}
  FILE_SPECIAL_ACCESS = FILE_ANY_ACCESS;
  {$EXTERNALSYM FILE_SPECIAL_ACCESS}
  FILE_READ_ACCESS    = $0001;           // file & pipe
  {$EXTERNALSYM FILE_READ_ACCESS}
  FILE_WRITE_ACCESS   = $0002;           // file & pipe
  {$EXTERNALSYM FILE_WRITE_ACCESS}

//
// IoControlCode values for storage devices
//

  IOCTL_STORAGE_BASE = FILE_DEVICE_MASS_STORAGE;
  {$EXTERNALSYM IOCTL_STORAGE_BASE}

//
// The following device control codes are common for all class drivers.  They
// should be used in place of the older IOCTL_DISK, IOCTL_CDROM and IOCTL_TAPE
// common codes
//

const
  IOCTL_STORAGE_CHECK_VERIFY = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0200 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_CHECK_VERIFY}
  IOCTL_STORAGE_CHECK_VERIFY2 = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0200 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_CHECK_VERIFY2}
  IOCTL_STORAGE_MEDIA_REMOVAL = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0201 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_MEDIA_REMOVAL}
  IOCTL_STORAGE_EJECT_MEDIA = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0202 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_EJECT_MEDIA}
  IOCTL_STORAGE_LOAD_MEDIA = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0203 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_LOAD_MEDIA}
  IOCTL_STORAGE_LOAD_MEDIA2 = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0203 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_LOAD_MEDIA2}
  IOCTL_STORAGE_RESERVE = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0204 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_RESERVE}
  IOCTL_STORAGE_RELEASE = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0205 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_RELEASE}
  IOCTL_STORAGE_FIND_NEW_DEVICES = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0206 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_FIND_NEW_DEVICES}

  IOCTL_STORAGE_EJECTION_CONTROL = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0250 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_EJECTION_CONTROL}
  IOCTL_STORAGE_MCN_CONTROL = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0251 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_MCN_CONTROL}

  IOCTL_STORAGE_GET_MEDIA_TYPES = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0300 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_GET_MEDIA_TYPES}
  IOCTL_STORAGE_GET_MEDIA_TYPES_EX = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0301 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_GET_MEDIA_TYPES_EX}
  IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0304 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_GET_MEDIA_SERIAL_NUMBER}
  IOCTL_STORAGE_GET_HOTPLUG_INFO = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0305 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_GET_HOTPLUG_INFO}
  IOCTL_STORAGE_SET_HOTPLUG_INFO = (
    (IOCTL_STORAGE_BASE shl 16) or ((FILE_READ_ACCESS or FILE_WRITE_ACCESS) shl 14) or
    ($0306 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_SET_HOTPLUG_INFO}

  IOCTL_STORAGE_RESET_BUS = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0400 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_RESET_BUS}
  IOCTL_STORAGE_RESET_DEVICE = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0401 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_RESET_DEVICE}
  IOCTL_STORAGE_BREAK_RESERVATION = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_READ_ACCESS shl 14) or
    ($0405 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_BREAK_RESERVATION}

  IOCTL_STORAGE_GET_DEVICE_NUMBER = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0420 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_GET_DEVICE_NUMBER}

  IOCTL_STORAGE_PREDICT_FAILURE = (
    (IOCTL_STORAGE_BASE shl 16) or (FILE_ANY_ACCESS shl 14) or
    ($0440 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM IOCTL_STORAGE_PREDICT_FAILURE}

//
// These ioctl codes are obsolete.  They are defined here to avoid resuing them
// and to allow class drivers to respond to them more easily.
//

  OBSOLETE_IOCTL_STORAGE_RESET_BUS = (
    (IOCTL_STORAGE_BASE shl 16) or ((FILE_READ_ACCESS or FILE_WRITE_ACCESS) shl 14) or
    ($0400 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM OBSOLETE_IOCTL_STORAGE_RESET_BUS}

  OBSOLETE_IOCTL_STORAGE_RESET_DEVICE = (
    (IOCTL_STORAGE_BASE shl 16) or ((FILE_READ_ACCESS or FILE_WRITE_ACCESS) shl 14) or
    ($0401 shl 2) or METHOD_BUFFERED);
  {$EXTERNALSYM OBSOLETE_IOCTL_STORAGE_RESET_DEVICE}