diff --git a/main.c b/main.c
index 7a00f8a..1ea3aa6 100644
--- a/main.c
+++ b/main.c
@@ -90,19 +90,19 @@ int main(int argc, char* argv[]) {
                         }
 
                         unsigned long drbytes = 0;
-                        if(history[i][1] > 0) {
-                                drbytes = rbytes - history[i][1];
+                        if(history[i][0] > 0) {
+                                drbytes = rbytes - (history[i][0] * bsize);
                         }
 
 
                         unsigned long dwblbks = 0;
-                        if (history[i][2] > 0) {
-                                dwblbks = wblks - history[i][2];
+                        if (history[i][1] > 0) {
+                                dwblbks = wblks - history[i][1];
                         }
 
                         unsigned long dwbytes = 0;
-                        if(history[i][3] > 0) {
-                                dwbytes = wbytes - history[i][3];
+                        if(history[i][1] > 0) {
+                                dwbytes = wbytes - (history[i][1] * bsize);
                         }
 
 
@@ -119,9 +119,7 @@ int main(int argc, char* argv[]) {
 				dwbytes);
 
                         history[i][0] = rblks;
-                        history[i][1] = rbytes;
-                        history[i][2] = wblks;
-                        history[i][3] = wbytes;
+                        history[i][1] = wblks;
                 }
 
                 sleep(10);