diff --git a/build/libraries/fs/ARM9/src/fs_loader.c b/build/libraries/fs/ARM9/src/fs_loader.c
index 5e4d0229..335e8311 100644
--- a/build/libraries/fs/ARM9/src/fs_loader.c
+++ b/build/libraries/fs/ARM9/src/fs_loader.c
@@ -194,13 +194,11 @@ BOOL FS_LoadBuffer( u8* dest, u32 size, SVCSHA1Context *ctx )
                 u32 u = unit - done < HASH_UNIT ? unit - done : HASH_UNIT;
                 SVC_SHA1Update( ctx, s, u );
                 MI_CpuCopyFast( s, d, u );
-                MI_CpuClearFast( s, u );    // OS_Bootでのクリアと比較する
             }
         }
         else
         {
             MI_CpuCopyFast( src, dest, unit );
-            MI_CpuClearFast( src, unit );   // OS_Bootでのクリアと比較する
         }
         DC_FlushRange( src, unit );
         size -= unit;
diff --git a/build/libraries/os/common/os_boot.c b/build/libraries/os/common/os_boot.c
index 61d6ed81..c5dbc494 100644
--- a/build/libraries/os/common/os_boot.c
+++ b/build/libraries/os/common/os_boot.c
@@ -65,6 +65,9 @@ void OS_BootWithRomHeaderFromFIRM( ROM_Header* rom_header )
     mem_list[i++] = (u32)OSi_GetFromFirmAddr()->rsa_pubkey[4];
     mem_list[i++] = ACS_PUBKEY_LEN;
 #else   // SDK_ARM7
+    /* FS_Loader用バッファのクリア */
+    mem_list[i++] = HW_FIRM_LOAD_BUFFER_BASE;
+    mem_list[i++] = HW_FIRM_LOAD_BUFFER_UNIT_SIZE * HW_FIRM_LOAD_BUFFER_UNIT_NUMS;
     {   /* REBOOT_ExecuteのCODEとSTACKの隙間をクリア */
         u32 stack_bottom = (u32)stack_top - OS_BOOT_STACK_SIZE_MIN - sizeof(mem_list);
         u32 code_buf_end = OS_BOOT_CODE_BUF + OS_BOOT_CODE_SIZE;