diff --git a/software/drive/disk_image.cc b/software/drive/disk_image.cc
index 09d65e64..ef5404bf 100644
--- a/software/drive/disk_image.cc
+++ b/software/drive/disk_image.cc
@@ -884,20 +884,7 @@ int BinImage :: format(const char *name)
 	uint8_t *track_18 = &bin_data[17*21*256];
 	uint8_t *bam_name = track_18 + 144;
 
-	uint8_t sector[256];
-	for (int i=0; i<256; i++) {
-		sector[i] = ~((uint8_t)i);
-	}
-	sector[0] = 0;
-	sector[1] = 0;
-
-//	memset(bin_data, 0, C1541_MAX_D64_LEN);
-	uint8_t *dest = bin_data;
-	int num_sectors = C1541_MAX_D64_LEN >> 8;
-	for (int i=0; i < num_sectors; i++, dest += 256) {
-		memcpy(dest, sector, 256);
-	}
-
+	memset(bin_data, 0, C1541_MAX_D64_LEN);
 	memcpy(track_18, bam_header, 144);
 
     // part that comes after bam header