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diff --git a/i386/i386at/disk.h b/i386/i386at/disk.h
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+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990,1989 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+/*
+  Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
+
+		All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and
+its documentation for any purpose and without fee is hereby
+granted, provided that the above copyright notice appears in all
+copies and that both the copyright notice and this permission notice
+appear in supporting documentation, and that the name of Intel
+not be used in advertising or publicity pertaining to distribution
+of the software without specific, written prior permission.
+
+INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
+INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
+IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
+CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
+NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/*
+ * disk.h
+ */
+
+/* Grab the public part.  */
+#include <mach/machine/disk.h>
+
+
+
+#define MAX_ALTENTS     253		/* Maximum # of slots for alts */
+					/* allowed for in the table. */
+
+#define ALT_SANITY      0xdeadbeef      /* magic # to validate alt table */
+
+struct  alt_table {
+	u_short	alt_used;		/* # of alternates already assigned */
+	u_short	alt_reserved;		/* # of alternates reserved on disk */
+	long	alt_base;		/* 1st sector (abs) of the alt area */
+	long	alt_bad[MAX_ALTENTS];	/* list of bad sectors/tracks	*/
+};
+
+struct alt_info {			/* table length should be multiple of 512 */
+	long	alt_sanity;		/* to validate correctness */
+	u_short	alt_version;		/* to corroborate vintage */
+	u_short	alt_pad;		/* padding for alignment */
+	struct alt_table alt_trk;	/* bad track table */
+	struct alt_table alt_sec;	/* bad sector table */
+};
+typedef struct alt_info altinfo_t;
+
+#define V_NUMPAR        16              /* maximum number of partitions */
+
+#define VTOC_SANE       0x600DDEEE      /* Indicates a sane VTOC */
+#define PDLOCATION	29		/* location of VTOC */
+
+#define BAD_BLK         0x80                    /* needed for V_VERIFY */
+/* BAD_BLK moved from old hdreg.h */
+
+
+#define	HDPDLOC		29		/* location of pdinfo/vtoc */
+#define	LBLLOC		1		/* label block for xxxbsd */
+
+/* Partition permission flags */
+#define V_OPEN          0x100           /* Partition open (for driver use) */
+#define V_VALID         0x200           /* Partition is valid to use */
+
+
+
+/* Sanity word for the physical description area */
+#define VALID_PD		0xCA5E600D
+
+struct localpartition	{
+	u_int 	p_flag;			/*permision flags*/
+	long	p_start;		/*physical start sector no of partition*/
+	long	p_size;			/*# of physical sectors in partition*/
+};
+typedef struct localpartition localpartition_t;
+
+struct evtoc {
+	u_int 	fill0[6];
+	u_int 	cyls;			/*number of cylinders per drive*/
+	u_int 	tracks;			/*number tracks per cylinder*/
+	u_int 	sectors;		/*number sectors per track*/
+	u_int 	fill1[13];
+	u_int 	version;		/*layout version*/
+	u_int 	alt_ptr;		/*byte offset of alternates table*/
+	u_short	alt_len;		/*byte length of alternates table*/
+	u_int 	sanity;			/*to verify vtoc sanity*/
+	u_int 	xcyls;			/*number of cylinders per drive*/
+	u_int 	xtracks;		/*number tracks per cylinder*/
+	u_int 	xsectors;		/*number sectors per track*/
+	u_short	nparts;			/*number of partitions*/
+	u_short	fill2;			/*pad for 286 compiler*/
+	char	label[40];
+	struct localpartition part[V_NUMPAR];/*partition headers*/
+	char	fill[512-352];
+};
+
+union   io_arg {
+	struct  {
+		u_short	ncyl;		/* number of cylinders on drive */
+		u_char	nhead;		/* number of heads/cyl */
+		u_char	nsec;		/* number of sectors/track */
+		u_short	secsiz;		/* number of bytes/sector */
+		} ia_cd;		/* used for Configure Drive cmd */
+	struct  {
+		u_short	flags;		/* flags (see below) */
+		long	bad_sector;	/* absolute sector number */
+		long	new_sector;	/* RETURNED alternate sect assigned */
+		} ia_abs;		/* used for Add Bad Sector cmd */
+	struct  {
+		u_short	start_trk;	/* first track # */
+		u_short	num_trks;	/* number of tracks to format */
+		u_short	intlv;		/* interleave factor */
+		} ia_fmt;		/* used for Format Tracks cmd */
+	struct	{
+		u_short	start_trk;	/* first track	*/
+		char	*intlv_tbl;	/* interleave table */
+		} ia_xfmt;		/* used for the V_XFORMAT ioctl */
+};
+
+
+#define BOOTSZ		446		/* size of boot code in master boot block */
+#define FD_NUMPART	4		/* number of 'partitions' in fdisk table */
+#define ACTIVE		128		/* indicator of active partition */
+#define	BOOT_MAGIC	0xAA55		/* signature of the boot record */
+#define	UNIXOS		99		/* UNIX partition */
+#define BSDOS		165
+#define LINUXSWAP	130
+#define LINUXOS		131
+extern	int		OS;		/* what partition we came from */
+
+/*
+ * structure to hold the fdisk partition table
+ */
+struct ipart {
+	u_char	bootid;			/* bootable or not */
+	u_char	beghead;		/* beginning head, sector, cylinder */
+	u_char	begsect;		/* begcyl is a 10-bit number. High 2 bits */
+	u_char	begcyl;			/*     are in begsect. */
+	u_char	systid;			/* OS type */
+	u_char	endhead;		/* ending head, sector, cylinder */
+	u_char	endsect;		/* endcyl is a 10-bit number.  High 2 bits */
+	u_char	endcyl;			/*     are in endsect. */
+	long	relsect;		/* first sector relative to start of disk */
+	long	numsect;		/* number of sectors in partition */
+};
+
+/*
+ * structure to hold master boot block in physical sector 0 of the disk.
+ * Note that partitions stuff can't be directly included in the structure
+ * because of lameo '386 compiler alignment design.
+ */
+struct  mboot {				     /* master boot block */
+	char	bootinst[BOOTSZ];
+	char	parts[FD_NUMPART * sizeof(struct ipart)];
+	u_short	signature;
+};
+