diff --git a/sys/dev/ata/atapi-cd.c b/sys/dev/ata/atapi-cd.c
index a8a8b8737294..e404b12d7d83 100644
--- a/sys/dev/ata/atapi-cd.c
+++ b/sys/dev/ata/atapi-cd.c
@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/cdio.h>
 #include <sys/cdrio.h>
 #include <sys/dvdio.h>
+#include <sys/disk.h>
 #include <sys/fcntl.h>
 #include <sys/conf.h>
 #include <sys/ctype.h>
@@ -1032,6 +1033,14 @@ acd_ioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct thread *td)
 	    error = EINVAL;
 	break;
 
+    case DIOCGMEDIASIZE:
+	*(off_t *)addr = cdp->disk_size * cdp->block_size;
+	break;
+
+    case DIOCGSECTORSIZE:
+	*(u_int *)addr = cdp->block_size;
+	break;
+
     default:
 	error = ENOTTY;
     }
diff --git a/sys/dev/ata/atapi-cd.h b/sys/dev/ata/atapi-cd.h
index 6184bee90c60..190b651bdcd6 100644
--- a/sys/dev/ata/atapi-cd.h
+++ b/sys/dev/ata/atapi-cd.h
@@ -318,8 +318,8 @@ struct acd_softc {
     struct acd_softc		**driver;	/* softc's of changer slots */
     int				slot;		/* this instance slot number */
     time_t			timestamp;	/* this instance timestamp */
-    int				disk_size;	/* size of current media */
-    int				block_size;	/* blocksize currently used */
+    u_int			disk_size;	/* size of current media */
+    u_int			block_size;	/* blocksize currently used */
     struct devstat		*stats;		/* devstat entry */
     dev_t			dev;		/* device place holders */
 #ifndef BURN_BRIDGES