mkntfs: set the physical drive and the extended boot signature to 0x80

in the Extended BPB which are needed to boot from disk

ChangeLog

@@ -5,6 +5,8 @@ xx/xx/2006 - 1.13.1-WIP
 	- Fix build with --disable-gnome-vfs --enable-fuse-module.  (Gentoo)
 	- ntfscluster: identify files even if their clusters aren't set
 	  in $Bitmap (useful to find potentially corrupted files). (Szaka)
+	- mkntfs: set the physical drive and the extended boot signature to
+	  0x80 in the Extended BPB which are needed to boot from disk. (Szaka)
 
 27/02/2006 - 1.13.0 - Lots and lots and lots of fixes and enhancements.
 

include/ntfs/layout.h

@@ -70,13 +70,10 @@ typedef struct {
 	u8  jump[3];			/* Irrelevant (jump to boot up code).*/
 	u64 oem_id;			/* Magic "NTFS    ". */
 /*0x0b*/BIOS_PARAMETER_BLOCK bpb;	/* See BIOS_PARAMETER_BLOCK. */
-	u8  unused[4];			/* zero, NTFS diskedit.exe states that
-					   this is actually:
-					    u8 physical_drive;		// 0x80
-					    u8 current_head;		// zero
-					    u8 extended_boot_signature; // 0x80
-					    u8 unused;			// zero
-					 */
+	u8 physical_drive;		/* 0x00 floppy, 0x80 hard disk */
+	u8 current_head;		/* zero */
+	u8 extended_boot_signature; 	/* 0x80 */
+	u8 reserved2;			/* zero */
 /*0x28*/s64 number_of_sectors;		/* Number of sectors in volume. Gives
 					   maximum volume size of 2^63 sectors.
 					   Assuming standard sector size of 512

ntfsprogs/mkntfs.c

@@ -4617,10 +4617,8 @@ static BOOL mkntfs_create_root_structures(void)
 	bs->bpb.hidden_sectors = cpu_to_le32(opts.part_start_sect);
 	ntfs_log_debug("hidden sectors = %llu (0x%llx)\n", opts.part_start_sect,
 			opts.part_start_sect);
-	/*
-	 * If there are problems go back to bs->unused[0-3] and set them. See
-	 * ../include/layout.h for details.
-	 */
+	bs->physical_drive = 0x80;  	    /* boot from hard disk */
+	bs->extended_boot_signature = 0x80; /* everybody sets this, so we do */
 	bs->number_of_sectors = cpu_to_sle64(opts.num_sectors);
 	bs->mft_lcn = cpu_to_sle64(g_mft_lcn);
 	bs->mftmirr_lcn = cpu_to_sle64(g_mftmirr_lcn);