grow i386 inside media a teeny bit

src/etc/etc.i386/disktab

@@ -1,4 +1,4 @@
-#	$OpenBSD: disktab,v 1.20 2010/07/02 20:33:54 tedu Exp $
+#	$OpenBSD: disktab,v 1.21 2010/10/19 20:23:53 deraadt Exp $
 
 floppy288|3in|3.5in High Density Floppy, 2.88MB:\
 	:dt=floppy:ty=floppy:se#512:nt#2:rm#300:ns#36:nc#80:\
@@ -20,6 +20,6 @@ floppy5|5in|5.25in High Density Floppy:\
 
 rdroot|ramdiskroot|RAM-disk root FS image:\
 	:ty=ramdisk:se#512:nt#2:ns#128:nc#16:\
-	:pa#3800:oa#0:ta=4.2BSD:ba#4096:fa#512:\
+	:pa#3872:oa#0:ta=4.2BSD:ba#4096:fa#512:\
 	:pb#0:ob#0:tb=swap:\
-	:pc#3800:oc#0:
+	:pc#3872:oc#0: