diff --git a/src/config.h b/src/config.h
index 37d4eba..adb6b5d 100644
--- a/src/config.h
+++ b/src/config.h
@@ -64,6 +64,7 @@
 #define FPGA_MCU_RDY_BIT          9
 
 #define QSORT_MAXELEM             2048
+#define SORT_STRLEN               256
 #define CLTBL_SIZE		  100
 
 #define DIR_FILE_MAX              16380
diff --git a/src/memory.c b/src/memory.c
index 50c7ac1..8dd2049 100644
--- a/src/memory.c
+++ b/src/memory.c
@@ -163,6 +163,19 @@ void sram_readblock(void* buf, uint32_t addr, uint16_t size) {
   FPGA_DESELECT();
 }
 
+void sram_readstrn(void* buf, uint32_t addr, uint16_t size) {
+  uint16_t count=size;
+  uint8_t* tgt = buf;
+  set_mcu_addr(addr);
+  FPGA_SELECT();
+  FPGA_TX_BYTE(0x88);	/* READ */
+  while(count--) {
+    FPGA_WAIT_RDY();
+    if(!(*(tgt++) = FPGA_RX_BYTE())) break;
+  }
+  FPGA_DESELECT();
+}
+
 void sram_writeblock(void* buf, uint32_t addr, uint16_t size) {
   uint16_t count=size;
   uint8_t* src = buf;
diff --git a/src/memory.h b/src/memory.h
index d24fe75..d6815ef 100644
--- a/src/memory.h
+++ b/src/memory.h
@@ -68,6 +68,7 @@ void sram_writebyte(uint8_t val, uint32_t addr);
 void sram_writeshort(uint16_t val, uint32_t addr);
 void sram_writelong(uint32_t val, uint32_t addr);
 void sram_readblock(void* buf, uint32_t addr, uint16_t size);
+void sram_readstrn(void* buf, uint32_t addr, uint16_t size);
 void sram_readlongblock(uint32_t* buf, uint32_t addr, uint16_t count);
 void sram_writeblock(void* buf, uint32_t addr, uint16_t size);
 void save_sram(uint8_t* filename, uint32_t sram_size, uint32_t base_addr);
diff --git a/src/sort.c b/src/sort.c
index 9596f7c..962d62e 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -15,7 +15,7 @@
 */
 
 uint32_t stat_getstring = 0;
-static char sort_str1[21], sort_str2[21];
+static char sort_str1[SORT_STRLEN+1], sort_str2[SORT_STRLEN+1];
 uint32_t ptrcache[QSORT_MAXELEM] IN_AHBRAM;
 
 /* get element from pointer table in external RAM*/
@@ -71,13 +71,12 @@ void sort_getstring_for_dirent(char *ptr, uint32_t addr) {
   if(addr & 0x80000000) {
     /* is directory link, name offset 4 */
     leaf_offset = sram_readbyte(addr + 4 + SRAM_MENU_ADDR);
-    sram_readblock(ptr, addr + 5 + leaf_offset + SRAM_MENU_ADDR, 20);
+    sram_readstrn(ptr, addr + 5 + leaf_offset + SRAM_MENU_ADDR, SORT_STRLEN);
   } else {
     /* is file link, name offset 6 */
     leaf_offset = sram_readbyte(addr + 6 + SRAM_MENU_ADDR);
-    sram_readblock(ptr, addr + 7 + leaf_offset + SRAM_MENU_ADDR, 20);
+    sram_readstrn(ptr, addr + 7 + leaf_offset + SRAM_MENU_ADDR, SORT_STRLEN);
   }
-  ptr[20]=0;
 }
 
 void sort_heapify(uint32_t addr, unsigned int i, unsigned int heapsize)