diff --git a/P8000_WDC_Emulator/P8000_WDC_Emulator/wdc_if_disk_perf.c b/P8000_WDC_Emulator/P8000_WDC_Emulator/wdc_if_disk_perf.c
new file mode 100644
index 0000000..9458333
--- /dev/null
+++ b/P8000_WDC_Emulator/P8000_WDC_Emulator/wdc_if_disk_perf.c
@@ -0,0 +1,165 @@
+/*
+ * mmc_perf.c
+ *
+ * Created: 07.06.2012 21:42:41
+ *  Author: olivleh1
+ */
+
+#include <avr/io.h>
+#include <avr/interrupt.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <avr/pgmspace.h>
+#include <avr/sleep.h>
+#include "config.h"
+#include "wdc_if_sdcard.h"
+#include "wdc_ram.h"
+#include "uart.h"
+
+#ifdef MEASURE_SDCARD_TIME
+#define BLOCKNO 550000
+
+extern  uint32_t overflow;
+
+/* switched from local to global for keeping an eye on memory usage */
+uint8_t data_buffer[4096];
+uint8_t cmd_buffer[9];
+
+
+void test_write4k(uint8_t numblocks, uint8_t nr_of_tests)
+{
+    uint32_t starttime;
+    uint32_t blockno = 0;
+    uint8_t i8, errorcode;
+
+    uart_puts_p ( PSTR ( "Test Write 5000 512B-Blocks with Multiblock-Write (4KB Blocksize):" ) );
+    uart_putc ( '\n' );
+    memset ( &data_buffer[0], 0xCC, WDC_BLOCKLEN * numblocks );
+    for ( i8 = 0; i8 < nr_of_tests; i8++ ) {
+        blockno = BLOCKNO;
+        for ( starttime = overflow; blockno < ( BLOCKNO + 5000 ); blockno += numblocks ) {
+            errorcode = wdc_write_multiblock ( blockno, data_buffer, numblocks );
+            if ( errorcode ) {
+                break;
+            }
+        }
+        if ( errorcode )
+        break;
+        uart_putdw_dec ( overflow - starttime );
+        uart_putc ( '\n' );
+    }
+
+}
+
+void test_read4k(uint8_t numblocks, uint8_t nr_of_tests)
+{
+    uint32_t starttime;
+    uint32_t blockno = 0;
+    uint8_t i8, errorcode;
+
+    uart_puts_p ( PSTR ( "Test Read 5000 512B-Blocks with Multiblock-Read (4KB Blocksize):" ) );
+    uart_putc ( '\n' );
+
+    for ( i8 = 0; i8 < nr_of_tests; i8++ ) {
+        blockno = BLOCKNO;
+        for ( starttime = overflow; blockno < ( BLOCKNO + 5000 ); blockno += numblocks ) {
+            errorcode = wdc_read_multiblock ( blockno, data_buffer, numblocks );
+            if ( errorcode ) {
+                break;
+            }
+        }
+        if ( errorcode )
+        break;
+        uart_putdw_dec ( overflow - starttime );
+        uart_putc ( '\n' );
+    }
+
+}
+
+void test_write512(uint8_t numblocks, uint8_t nr_of_tests)
+{
+    uint32_t starttime;
+    uint32_t blockno = 0;
+    uint8_t i8, errorcode;
+
+    uart_puts_p ( PSTR ( "Test Write 5000 512B-Blocks with Singleblock-Write (512B Blocksize):" ) );
+    uart_putc ( '\n' );
+    memset ( &data_buffer[0], 0xCC, WDC_BLOCKLEN * numblocks );
+    for ( i8 = 0; i8 < nr_of_tests; i8++ ) {
+        blockno = BLOCKNO;
+        for ( starttime = overflow; blockno < ( BLOCKNO + 5000 ); blockno++ ) {
+            errorcode = wdc_write_sector ( blockno, data_buffer );
+            if ( errorcode ) {
+                break;
+            }
+        }
+        if ( errorcode )
+        break;
+        uart_putdw_dec ( overflow - starttime );
+        uart_putc ( '\n' );
+    }
+
+}
+
+void test_read512(uint8_t numblocks, uint8_t nr_of_tests)
+{
+    uint32_t starttime;
+    uint32_t blockno = 0;
+    uint8_t i8, errorcode;
+
+    uart_puts_p ( PSTR ( "Test Read 5000 512B-Blocks with Multiblock-Read (4KB Blocksize):" ) );
+    uart_putc ( '\n' );
+
+    for ( i8 = 0; i8 < nr_of_tests; i8++ ) {
+        blockno = BLOCKNO;
+        for ( starttime = overflow; blockno < ( BLOCKNO + 5000 ); blockno += numblocks ) {
+            errorcode = wdc_read_multiblock ( blockno, data_buffer, numblocks );
+            if ( errorcode ) {
+                break;
+            }
+        }
+        if ( errorcode )
+        break;
+        uart_putdw_dec ( overflow - starttime );
+        uart_putc ( '\n' );
+    }
+
+}
+
+void measure_performance()
+{
+    uint8_t numblocks = 4;
+    uint8_t nr_of_tests = 2;
+
+    sei();
+    TIMSK0 |= ( 0x01 << TOIE0 );
+    TCCR0B = ( 1 << CS01 ); /* Prescaler 8 */
+    TCNT0 = 0x00;
+
+    uart_puts_p ( PSTR ( "Performance Measurement. Displayed are the Timer-Overflows." ) );
+    uart_putc ( '\n' );
+    uart_puts_p ( PSTR ( "Timer is initialized with a Prescaler 8" ) );
+    uart_putc ( '\n' );
+
+    test_write512(numblocks,nr_of_tests);
+    test_read512(numblocks,nr_of_tests);
+    test_write512(numblocks,nr_of_tests);
+    test_read4k(numblocks,nr_of_tests);
+    test_write4k(numblocks,nr_of_tests);
+    test_read4k(numblocks,nr_of_tests);
+    test_write512(numblocks,nr_of_tests);
+    test_write4k(numblocks,nr_of_tests);
+    test_read512(numblocks,nr_of_tests);
+    test_read4k(numblocks,nr_of_tests);
+    test_read512(numblocks,nr_of_tests);
+    test_write4k(numblocks,nr_of_tests);
+    test_write512(numblocks,nr_of_tests);
+
+    uart_puts_p ( PSTR ( "End" ) );
+    uart_putc ( '\n' );
+
+    while ( 1 );
+}
+
+#endif
\ No newline at end of file