Ассемблер, работа с дисками

.286
.model small
.stack 100h

.data
ReadErrorMsg db "Can't read fat!",13,10,"$"
PressAny db "Press any key to exit",13,10,"$"
Input db "Input file name: $"
NotFound db "File not found",13,10,"$"
FileClaster db "First file claster is: ",13,10,"$"
NewLine db 13,10,"$"

FileName db 12 ; Max len
FileNameLen db (?)
FileNameData db 16 dup (?)
.data?
buff db 0200h dup (?)
root db 1c00h dup (?)
fatname db 13 dup (?)
.code
start:
push @Data
pop ds

; Boot sector
mov ax, 0 ; drive A
mov cx, 1
mov dx, 0
mov bx, offset buff
int 25h
jc ReadError