diff --git a/HBC/META.XML b/HBC/META.XML
index 3ace37e0..df6f7cab 100644
--- a/HBC/META.XML
+++ b/HBC/META.XML
@@ -2,8 +2,8 @@
 	<app version="1">
 		<name> USB Loader GX</name>
 		<coder>USB Loader GX Team</coder>
-		<version>1.0 r882</version>
-		<release_date>201001031700</release_date>
+		<version>1.0 r883</version>
+		<release_date>201001041352</release_date>
 		<short_description>Loads games from USB-devices</short_description>
 		<long_description>USB Loader GX is a libwiigui based USB iso loader with a wii-like GUI. You can install games to your HDDs and boot them with shorter loading times.
 The interactive GUI is completely controllable with WiiMote, Classic Controller or GC Controller.
diff --git a/source/usbloader/wbfs.c b/source/usbloader/wbfs.c
index ab196ee2..415c5242 100644
--- a/source/usbloader/wbfs.c
+++ b/source/usbloader/wbfs.c
@@ -621,9 +621,7 @@ s32 WBFS_ReIDGame(u8 *discid, const void *newID)
 
 f32 WBFS_EstimeGameSize(void) {
 	if (wbfs_part_fs) {
-		u64 comp;
-		WBFS_FAT_DVD_Size(&comp, NULL);
-		return comp;
+		return WBFS_FAT_EstimateGameSize();
 	}
 
 	partition_selector_t part_sel;
diff --git a/source/usbloader/wbfs_fat.c b/source/usbloader/wbfs_fat.c
index 4006d22d..1868ef54 100644
--- a/source/usbloader/wbfs_fat.c
+++ b/source/usbloader/wbfs_fat.c
@@ -648,3 +648,26 @@ s32 WBFS_FAT_ReIDGame(u8 *discid, const void *newID)
 
 	return ret;
 }
+
+s32 WBFS_FAT_EstimateGameSize(void) {
+	wbfs_t *part = NULL;
+	u64 size = (u64)143432*2*0x8000ULL;
+	u32 n_sector = size / fat_sector_size;
+	u32 wii_sec_sz; 
+
+	// init a temporary dummy part
+	// as a placeholder for wbfs_size_disc
+	part = wbfs_open_partition(
+			nop_read_sector, nop_write_sector,
+			NULL, fat_sector_size, n_sector, 0, 1);
+	if (!part) return -1;
+	wii_sec_sz = part->wii_sec_sz;
+	
+	partition_selector_t part_sel;
+	if (Settings.fullcopy) {
+		part_sel = ALL_PARTITIONS;
+	} else {
+		part_sel = Settings.partitions_to_install == install_game_only ? ONLY_GAME_PARTITION : ALL_PARTITIONS;
+	}
+    return wbfs_estimate_disc(part, __WBFS_ReadDVD, NULL, part_sel);
+}
diff --git a/source/usbloader/wbfs_fat.h b/source/usbloader/wbfs_fat.h
index e8b65da7..703afd42 100644
--- a/source/usbloader/wbfs_fat.h
+++ b/source/usbloader/wbfs_fat.h
@@ -12,7 +12,8 @@ s32  WBFS_FAT_RemoveGame(u8 *discid);
 s32  WBFS_FAT_AddGame(void);
 s32  WBFS_FAT_DVD_Size(u64 *comp_size, u64 *real_size);
 int  WBFS_FAT_find_fname(u8 *id, char *fname, int len);
-s32 WBFS_FAT_RenameGame(u8 *discid, const void *newname);
-s32 WBFS_FAT_ReIDGame(u8 *discid, const void *newID);
+s32  WBFS_FAT_RenameGame(u8 *discid, const void *newname);
+s32  WBFS_FAT_ReIDGame(u8 *discid, const void *newID);
+s32  WBFS_FAT_EstimateGameSize(void);
 
 #endif