As any programmer in the world at least once in his/her life, I am trying to create my "revolutionary", the new and only one operating system. :D

Well, I am using a virtual emulator (Oracle VM Virtual Box), for which I create a new unknwon operating system, with a vmdk disk. I like vmdk because they are just plain files, so I can paste my boot-loader over the first 512 bytes of the virtual hard disk.

Now, I am trying to read the next sector of this virtual disk, on which I would paste a simple kernel that would display a message.

I have two questions:

• Am I reading the second segment (the first -512 bytes- is occupied by the bootloader) correctly? CODE:

  CitesteDisc:
      mov bx, 0x8000  ; segment
      mov es, bx
      mov bx, 0x0000  ; offset
  
      mov ah, 0x02  ; read function
      mov al, 0x01  ; sectors - this might be wrong, trying to read from hd
      mov ch, 0x00  ; cylinder
      mov cl, 0x02  ; sector
      mov dh, 0x00  ; head
      mov dl, 0x80  ; drive - trying to read from hd
      int 0x13   ; disk int
      mov si, ErrorMessage ; - This will display an error message
      jc ShowMessage
      jmp [es:bx]   ; buffer
  

  Here, I get the error message, after checking CF. However, if I use INT 13, 1 to get last status message, AL is 0 - so no error is saved.

• Am I pasting my simple kernel in the correct place inside the vmdk? What I do is pasting it after the 512th byte of the file, the first 512 bytes, as I said, are the boot-loader. The file would look like this:

  BE 45 7C E8 16 00 EB FE B4 0E B7 00 B3 07 CD 10 <- First sector
  C3 AC 08 C0 74 05 E8 EF FF EB F6 C3 B4 00 B2 80
  CD 13 BE 5D 7C 72 F5 BB 00 80 8E C3 BB 00 00 B4 
  02 B0 06 B5 00 B1 01 B6 00 B2 07 CD 13 BE 4E 7C 
  72 CF 26 FF 27 57 65 6C 63 6F 6D 65 21 00 52 65 
  61 64 69 6E 67 20 65 72 72 6F 72 21 00 52 65 73 
  65 74 74 69 6E 67 20 65 72 72 6F 72 21 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 AA <- Boot-loader signature
  B4 0E B0 2E CD 10 EB FE 00 00 00 00 00 00 00 00 <- Start of the second sector
  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  

So, this is the way I am trying to add the kernel to the second sector. What do you think is wrong with this? Thanks!