Index: uspace/srv/fs/fat/fat.h
===================================================================
--- uspace/srv/fs/fat/fat.h	(revision be815bc34ea5c9d442f237c8bd5d4bc86b379499)
+++ uspace/srv/fs/fat/fat.h	(revision 5af627fc59c072c3aafa7b9e9ec7aa8a5c581cac)
@@ -41,4 +41,75 @@
 #define dprintf(...)	printf(__VA_ARGS__)
 
+typedef struct {
+	uint8_t		ji[3];		/**< Jump instruction. */
+	uint8_t		oem_name[8];
+	/* BIOS Parameter Block */
+	uint16_t	bps;		/**< Bytes per sector. */
+	uint8_t		spc;		/**< Sectors per cluster. */
+	uint16_t	rsc;		/**< Reserved sector count. */
+	uint8_t		fatcnt;		/**< Number of FATs. */
+	uint16_t	root_ent_max;	/**< Maximum number of root directory
+					     entries. */
+	uint16_t	totsec;		/**< Total sectors. */
+	uint8_t		mdesc;		/**< Media descriptor. */
+	uint16_t	sec_per_fat;	/**< Sectors per FAT12/FAT16. */
+	uint16_t	sec_per_track;	/**< Sectors per track. */
+	uint16_t	headcnt;	/**< Number of heads. */
+	uint32_t	hidden_sec;	/**< Hidden sectors. */
+	uint32_t	total_sec;	/**< Total sectors. */
+
+	union {
+		struct {
+			/* FAT12/FAT16 only: Extended BIOS Parameter Block */
+			/** Physical drive number. */
+			uint8_t		pdn;
+			uint8_t		reserved;
+			/** Extended boot signature. */
+			uint8_t		ebs;
+			/** Serial number. */
+			uint32_t	id;
+			/** Volume label. */
+			uint8_t		label[11];
+			/** FAT type. */
+			uint8_t		type[8];
+			/** Boot code. */
+			uint8_t		boot_code[448];
+			/** Boot sector signature. */
+			uint16_t	signature;
+		} __attribute__ ((packed));
+		struct {
+			/* FAT32 only */
+			/** Sectors per FAT. */
+			uint32_t	sectors_per_fat;
+			/** FAT flags. */
+			uint16_t	flags;
+			/** Version. */
+			uint16_t	version;
+			/** Cluster number of root directory. */
+			uint32_t	root_cluster;
+			/** Sector number of file system information sector. */
+			uint16_t	fsinfo_sec;
+			/** Sector number of boot sector copy. */
+			uint16_t	bscopy_sec;
+			uint8_t		reserved1[12];
+			/** Physical drive number. */
+			uint8_t		pdn;
+			uint8_t		reserved2;
+			/** Extended boot signature. */
+			uint8_t		ebs;
+			/** Serial number. */
+			uint32_t	id;
+			/** Volume label. */
+			uint8_t		label;
+			/** FAT type. */
+			uint8_t		type[8];
+			/** Boot code. */
+			uint8_t		boot_code[420];
+			/** Signature. */
+			uint16_t	signature;
+		} __attribute__ ((packed));
+	}; 
+} fat_bs_t __attribute__ ((packed));
+
 extern uint8_t *plb_ro;