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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\DeviceDisplayObjects\SetupClassInformation\{4d36e980-e325-11ce-bfc1-08002be10318}]
"Rank"=dword:000023fa
"Category"="Storage.FDD"

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type
  MEDIA_TYPE = (
    mtUnknown          = 0,
    mtF5_1Pt2_512      = 1,
    mtF3_1Pt44_512     = 2,
    mtF3_2Pt88_512     = 3,
    mtF3_20Pt8_512     = 4,
    mtF3_720_512       = 5,
    mtF5_360_512       = 6,
    mtF5_320_512       = 7,
    mtF5_320_1024      = 8,
    mtF5_180_512       = 9,
    mtF5_160_512       = 10,
    mtRemovableMedia   = 11,
    mtFixedMedia       = 12,
    mtF3_120M_512      = 13,
    mtF3_640_512       = 14,
    mtF5_640_512       = 15,
    mtF5_720_512       = 16,
    mtF3_1Pt2_512      = 17,
    mtF3_1Pt23_1024    = 18,
    mtF5_1Pt23_1024    = 19,
    mtF3_128Mb_512     = 20,
    mtF3_230Mb_512     = 21,
    mtF8_256_128       = 22,
    mtF3_200Mb_512     = 23,
    mtF3_240M_512      = 24,
    mtF3_32M_512       = 25
  );

function GetDriveFormFactor(DriveLetter: string): MEDIA_TYPE;
type
  DISK_GEOMETRY = record
    Cylinders: LARGE_INTEGER;
    MediaType: MEDIA_TYPE;
    TracksPerCylinder, SectorsPerTrack, BytesPerSector: ULONG;
  end;
  PDISK_GEOMETRY = ^DISK_GEOMETRY;
var
  Geometry: DISK_GEOMETRY;
  h: THandle;
  cb: DWord;
begin
  Result := mtUnknown;
  h := CreateFile(PChar('\\.\' + DriveLetter + ':'), 0, FILE_SHARE_WRITE, nil, OPEN_EXISTING, 0, 0);
  If (h <> INVALID_HANDLE_VALUE)
    and DeviceIoControl(h, IOCTL_DISK_GET_DRIVE_GEOMETRY, nil, 0, @Geometry, SizeOf(DISK_GEOMETRY), cb, nil)
    and (cb > 0) then
    Result := Geometry.MediaType;
  CloseHandle(h);
end;