Use 8k ffs blocks in the miniroot to bypass a clustering bug

src/etc/etc.amiga/disktab

@@ -1,5 +1,5 @@
 #
-#	$OpenBSD: disktab,v 1.6 1997/05/02 13:26:43 niklas Exp $
+#	$OpenBSD: disktab,v 1.7 1997/05/03 22:19:14 niklas Exp $
 #	$NetBSD: disktab,v 1.4 1995/11/28 05:40:23 jtc Exp $
 #
 # Disk geometry and partition layout tables. 
@@ -48,6 +48,6 @@ floppyhd|floppy3hd|3inhd|Amiga 3.5in High Density Floppy:\
 miniroot:\
 	:ty=winchester:se#512:nt#2:rm#300:ns#64:nc#80:\
 	:ts=3500:\
-	:pa#10240:oa#0:ba#4096:fa#512:ta=4.2BSD:\
+	:pa#10240:oa#0:ba#8192:fa#1024:ta=4.2BSD:\
 	:pb#0:ob#0:\
 	:pc#10240:oc#0: