New Hybrid Boot documentation

doc/Hybrid-Boot/README.md

@@ -135,27 +135,28 @@ Copy [winre-uefi.bcd](winre-uefi.bcd) and [winre-bios.bcd](winre-bios.bcd):
 ## Windows Hybrid Boot
 
 Windows can not be booted from BIOS and UEFI with the same configuration.
+
 The above procedure enables Windows to boot using UEFI.
 
-### Boot in BIOS
+Do *not* use `sgdisk` for MBR modifications,
+because it wipes the MBR boot code of GRUB.
+
+### Boot from BIOS
 
 Windows needs an MBR to boot from BIOS:
 
-	sgdisk --hybrid=3 $dev
-	printf DISK | dd bs=1 seek=440 conv=notrunc of=$dev
+	printf 'label-id:0x4b534944\n1,0x7fff,ee\n0x8000,0xf8000,27' | sfdisk -Y dos $dev
 
 If you try to boot without the above configuration,
 the following message appears in the blink of an eye:
 
 	ata1 master: Unknown device
 
-### Boot in UEFI
+### Boot from UEFI
 
 Remove the hybrid MBR:
 
-	echo start=1,type=ee | sfdisk -Y dos $dev
-
-Do *not* use `sgdisk` because it wipes the MBR boot code of GRUB.
+	printf 'label-id:0x00000000\n1,,ee' | sfdisk -Y dos $dev
 
 If you try to boot without the above configuration,
 the following message appears: