CD/DVD byte reading?

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C#

Hi,
i'm trying to read CD/DVD bytes.
But when Stream() is Seek() over to 102400 offset, ReadByte() returns -1. It's problem only for CD discs.
Here's my code:

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
internal static extern SafeFileHandle CreateFile(string lpFileName,
            FileAccess dwDesiredAccess,
            FileShare dwShareMode,
            uint lpSecurityAttributes,
            FileMode dwCreationDisposition,
            int flagsAndAttributes,
            uint hTemplateFile);
 
Microsoft.Win32.SafeHandles.SafeFileHandle handle = null;
handle = CreateFile("\\\\.\\E:",
                    FileAccess.Read,
                    FileShare.Read,
                    0,
                    FileMode.Open,
                    FILE_FLAG_NO_BUFFERING | FILE_FLAG_SEQUENTIAL_SCAN,
                    0);
 
Stream strm= new FileStream(handle, FileAccess.Read);
 
strm.Seek(24608768, SeekOrigin.Begin); 
 
int dt=strm.ReadByte(); // here it returns -1 

How can i read all of the disc bytes?

[edit]"Ignore HTML..." option disabled to allow code block to work - OriginalGriff[/edit]