SCSI-2 device serial number

Problem/Question/Abstract:

For IDE harddisk you can use S.M.A.R.T. API function for extracting serial number. For SCSI it does not work.

Answer:

program ScsiSN;

// PURPOSE: Simple console application that display SCSI harddisk serial number

{$APPTYPE CONSOLE}

uses
  Windows, SysUtils;

//-------------------------------------------------------------

function GetDeviceHandle(sDeviceName: string): THandle;
begin
  Result := CreateFile(PChar('\\.\' + sDeviceName),
    GENERIC_READ or GENERIC_WRITE,
    FILE_SHARE_READ or FILE_SHARE_WRITE,
    nil, OPEN_EXISTING, 0, 0)
end;

//-------------------------------------------------------------

function ScsiHddSerialNumber(DeviceHandle: THandle): string;
{$ALIGN ON}
type
  TScsiPassThrough = record
    Length: Word;
    ScsiStatus: Byte;
    PathId: Byte;
    TargetId: Byte;
    Lun: Byte;
    CdbLength: Byte;
    SenseInfoLength: Byte;
    DataIn: Byte;
    DataTransferLength: ULONG;
    TimeOutValue: ULONG;
    DataBufferOffset: DWORD;
    SenseInfoOffset: ULONG;
    Cdb: array[0..15] of Byte;
  end;
  TScsiPassThroughWithBuffers = record
    spt: TScsiPassThrough;
    bSenseBuf: array[0..31] of Byte;
    bDataBuf: array[0..191] of Byte;
  end;
  {ALIGN OFF}
var
  dwReturned: DWORD;
  len: DWORD;
  Buffer: array[0..SizeOf(TScsiPassThroughWithBuffers) +
  SizeOf(TScsiPassThrough) - 1] of Byte;
  sptwb: TScsiPassThroughWithBuffers absolute Buffer;
begin
  Result := '';
  FillChar(Buffer, SizeOf(Buffer), #0);
  with sptwb.spt do
  begin
    Length := SizeOf(TScsiPassThrough);
    CdbLength := 6; // CDB6GENERIC_LENGTH
    SenseInfoLength := 24;
    DataIn := 1; // SCSI_IOCTL_DATA_IN
    DataTransferLength := 192;
    TimeOutValue := 2;
    DataBufferOffset := PChar(@sptwb.bDataBuf) - PChar(@sptwb);
    SenseInfoOffset := PChar(@sptwb.bSenseBuf) - PChar(@sptwb);
    Cdb[0] := $12; // OperationCode := SCSIOP_INQUIRY;
    Cdb[1] := $01; // Flags := CDB_INQUIRY_EVPD;  Vital product data
    Cdb[2] := $80; // PageCode            Unit serial number
    Cdb[4] := 192; // AllocationLength
  end;
  len := sptwb.spt.DataBufferOffset + sptwb.spt.DataTransferLength;
  if DeviceIoControl(DeviceHandle, $0004D004, @sptwb, SizeOf(TScsiPassThrough),
    @sptwb, len, dwReturned, nil)
    and ((PChar(@sptwb.bDataBuf) + 1)^ = #$80) then
    SetString(Result, PChar(@sptwb.bDataBuf) + 4,
      Ord((PChar(@sptwb.bDataBuf) + 3)^));
end;

//=============================================================
var
  hDevice: THandle = 0;
  sSerNum, sDeviceName: string;

begin
  sDeviceName := ParamStr(1);
  if sDeviceName = '' then
  begin
    WriteLn;
    WriteLn('Display SCSI-2 device serial number.');
    WriteLn;
    WriteLn('Using:');
    WriteLn;
    if Win32Platform = VER_PLATFORM_WIN32_NT then // Windows NT/2000
      WriteLn('  ScsiSN PhysicalDrive0')
    else
      WriteLn('  ScsiSN C:');
    WriteLn('  ScsiSN Cdrom0');
    WriteLn('  ScsiSN Tape0');
    WriteLn;
    Exit;
  end;
  hDevice := GetDeviceHandle(sDeviceName);
  if hDevice = INVALID_HANDLE_VALUE then
    WriteLn('Error on GetDeviceHandle: ', SysErrorMessage(GetLastError))
  else
  try
    sSerNum := ScsiHddSerialNumber(hDevice);
    if sSerNum = '' then
      WriteLn('Error on DeviceIoControl: ',
        SysErrorMessageGetLastError))
else
  WriteLn('Device ' + sDeviceName
    + ' serial number = "', sSerNum, '"');
  finally
  CloseHandle(hDevice);
end;
end.

For more information about SCSI commands:

ftp://ftp.t10.org/t10/drafts/scsi-1/
ftp://ftp.t10.org/t10/drafts/spc/
ftp://ftp.t10.org/t10/drafts/spc2/