OSDev.org

Hi all
Could anybody tell me what is wrong with this boot sector.

;;;OS Boot

org 0x7c00

use16


begin: jmp Start
nop

OEM_ID: db '********'
BytesPerSector: dw 0x0200
SectorsPerCluster: db 0x01
ReservedSectors: dw 0x0001
TotalFATS: db 0x02
MaxRootEntries: dw 0x0e00
TotalSectors: dw 0x0b40
MediaDesciptor: db 0xf0
SectorsPerFAT: dw 0x0009
SectorsPerTrack: dw 0x0012
SidesOnDisk: dw 0x0002
HiddenSectors: dd 0x00000000
TotalSectorsLarge: dd 0x00000000
DriveNumber: db 0x00
Flags: db 0x00
Signature: db 0x29
VolumeID: dd 0xffffffff
VolumeLabel: db '************'
SystemID: db 'FAT12 '

Start:
xor ax,ax
cli
mov ss,ax
mov sp,0x7c00
mov ss,ax
sti
;;;Do some basic checks
;;See if we have an AMD x64
;;;See if we have VBE v3.0
mov ax,0x4f02
mov bx,0x003f
int 0x10
mov si,STitle
call WriteStr
;;;Display graphics card memory
;;;Display useable memory above 1 meg - memory required for the display
Self: jmp Self


WriteChar:
mov ah,0x0e
int 0x10
ret
WriteStr:
mov al,byte[si]
call WriteChar
inc si
cmp byte[si],0x00
je Exit1
jmp WriteStr
Exit1: ret
STitle: db 'Just a test!!',0x00
rb begin+512-2-$
BootSig: dw 0xaa55

Could just be WinXp but when I try to get info from the 'dir' command everything is displayed except that it says there is no
volume label ???

Microsoft in all its wisdom decided to put the volume label in the root directory (There is a type of file called "Volume ID", its name is obviously the volume label), I don't know why they thought that this was a good idea (They never use OEMName or FilSysType either).

the volume label is a special directory entry that should be in the root directory (special flags and stuff). So there's probably nothing wrong with the bootsector itself, but rather with the directory content...

Thanks everybody
The sites I have visited soft of fail to mention this ???