Index: vl.c
===================================================================
--- vl.c	(revision 688)
+++ vl.c	(revision 689)
@@ -5788,6 +5788,10 @@
     return 0;
 }
 
+/* The PREV_BDRV_HASH_BLOCK_SIZE is used for converter */
+/* It can be set to the default of 1024, and then it */
+/* reads old format and writes new format */
+#define PREV_BDRV_HASH_BLOCK_SIZE 16384
 #define BDRV_HASH_BLOCK_SIZE 16384
 #define IOBUF_SIZE 4096
 #define RAM_CBLOCK_MAGIC 0xfabe
@@ -6013,7 +6017,7 @@
         return -EINVAL;
     if (ram_decompress_open(s, f) < 0)
         return -EINVAL;
-    for(i = 0; i < phys_ram_size; i+= BDRV_HASH_BLOCK_SIZE) {
+    for(i = 0; i < phys_ram_size; i+= PREV_BDRV_HASH_BLOCK_SIZE) {
 #ifdef USE_KVM
         if (kvm_allowed && (i>=0xa0000) && (i<0xc0000)) /* do not access video-addresses */
             continue;
@@ -6023,7 +6027,7 @@
             goto error;
         }
         if (buf[0] == 0) {
-            if (ram_decompress_buf(s, phys_ram_base + i, BDRV_HASH_BLOCK_SIZE) < 0) {
+            if (ram_decompress_buf(s, phys_ram_base + i, PREV_BDRV_HASH_BLOCK_SIZE) < 0) {
                 fprintf(stderr, "Error while reading ram block address=0x%08x", i);
                 goto error;
             }
@@ -6041,7 +6045,7 @@
                 goto error;
             }
             if (bdrv_read(bs_table[bs_index], sector_num, phys_ram_base + i, 
-                          BDRV_HASH_BLOCK_SIZE / 512) < 0) {
+                          PREV_BDRV_HASH_BLOCK_SIZE / 512) < 0) {
                 fprintf(stderr, "Error while reading sector %d:%" PRId64 "\n", 
                         bs_index, sector_num);
                 goto error;