從扇區軟盤

Question

mov  ah, 0x02    ; read floppy sector function 
    mov  al, 1     ; read 1 sector 
    mov  ch, 1     ; we are reading the second sector past us, so its still on track 1 
    mov  cl, 2     ; sector to read (The second sector) 
    mov  dh, 0     ; head number 
    mov  dl, 0     ; drive number. Remember Drive 0 is floppy drive. 
    int  0x13     ; call BIOS - Read the sector 

上閱讀這是例子代碼：http://www.brokenthorn.com/Resources/OSDev5.html

我真的不明白這個部分：

 mov  ch, 1     ; we are reading the second sector past us, so its still on track 1 
     mov  cl, 2     ; sector to read (The second sector) 

好了，所以第一個扇區是引導扇區（扇區0）。因此後，該部門是部門1

所以它不應該是？：

mov ch, 0  ;First track 
mov cl, 1  ;second sector on first track 

Answer 1

扇區數爲1型，而磁道數是從0開始的。 Int13是這樣的時髦。

http://stanislavs.org/helppc/int_13-2.html