diff --git a/bin/driver7M5.bin b/bin/driver7M5.bin
index 2e1d3a8..473213c 100755
Binary files a/bin/driver7M5.bin and b/bin/driver7M5.bin differ
diff --git a/bin/rom8M.bin b/bin/rom8M.bin
index 5019861..21e9d2b 100755
Binary files a/bin/rom8M.bin and b/bin/rom8M.bin differ
diff --git a/rdisk.c b/rdisk.c
index 72fc516..627e01f 100644
--- a/rdisk.c
+++ b/rdisk.c
@@ -275,9 +275,13 @@ OSErr RDCtl(CntrlParamPtr p, DCtlPtr d) {
 		case kFormat:
 			if (!c->status.diskInPlace || c->status.writeProt ||
 				!c->ramdisk) { return controlErr; } 
-			long long zero = 0;
-			if (*MMU32bit) { copy24(c->ramdisk, (Ptr)(&zero), sizeof(zero)); }
-			else { copy24(c->ramdisk, StripAddress((Ptr)(&zero)), sizeof(zero)); }
+			long long z = 0;
+			Ptr pz;
+			if (*MMU32bit) { p = (Ptr)&z; }
+			else { StripAddress((Ptr)&z); }
+			for (int i = 0; i < 4095; i++) {
+				copy24(c->ramdisk + i * sizeof(z), pz, sizeof(z));
+			}
 			return noErr;
 		case kVerify:
 			if (!c->status.diskInPlace) { return controlErr; }