diff --git a/headers/os/kernel/fs_device.h b/headers/os/kernel/fs_device.h
new file mode 100644
index 0000000000..41360d6e93
--- /dev/null
+++ b/headers/os/kernel/fs_device.h
@@ -0,0 +1,59 @@
+// fs_devices.h
+
+#ifndef _FS_DEVICE_H
+#define _FS_DEVICE_H
+
+#include <Drivers.h>
+#include <OS.h>
+#include <SupportDefs.h>
+
+// session flags
+enum {
+	B_DATA_SESSION			= 0x01,	/* data session */
+	B_VIRTUAL_SESSION		= 0x02,	/* e.g. hard disk */
+};
+
+typedef struct session_info {
+	off_t	offset;				/* offset from start of device (in bytes) */ 
+	off_t	size;				/* size (in bytes) */ 
+	int32	logical_block_size;	/* logical block size (in bytes) */ 
+	int32	index;				/* session index */
+	uint32	flags;				/* session flags */
+} session_info;
+
+// partition flags
+enum {
+	B_HIDDEN_PARTITION		= 0x01,	/* non-file system partition */
+	B_VIRTUAL_PARTITION		= 0x02,	/* e.g. floppy */
+	B_EMPTY_PARTITION		= 0x04,	/* empty partition, implies
+									   B_HIDDEN_PARTITION */
+};
+
+typedef struct extended_partition_info {
+	partition_info	info;
+	uint32	flags;					/* partition flags */
+	char	partition_name[B_FILE_NAME_LENGTH];
+	char	partition_type[B_FILE_NAME_LENGTH];
+	char	file_system_short_name[B_FILE_NAME_LENGTH];	/* "", if hidden */
+	char	file_system_long_name[B_FILE_NAME_LENGTH];	/* or unknown FS */
+	char	volume_name[B_FILE_NAME_LENGTH];			/* "", if hidden */
+	char	mounted_at[B_FILE_NAME_LENGTH];				/* "", if not mounted */
+										//< better B_PATH_NAME_LENGTH?
+	uint8	partition_code;
+} extended_partition_info;
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+status_t get_nth_session_info(int deviceFD, int32 index,
+							  session_info *sessionInfo);
+status_t get_nth_partition_info(int deviceFD, int32 sessionIndex,
+								int32 partitionIndex,
+								extended_partition_info *partitionInfo);
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif _FS_DEVICE_H