diff --git a/kaleid/kernel/sh/shcmds.c b/kaleid/kernel/sh/shcmds.c
index f563634..2839796 100644
--- a/kaleid/kernel/sh/shcmds.c
+++ b/kaleid/kernel/sh/shcmds.c
@@ -127,20 +127,20 @@ error_t CmdDie(int argc, char **argv, char *cmdline)
 
 error_t CmdDumpATASect(int argc, char **argv, char *cmdline)
 {
-    char sector[1024] = {0};
+    char sector[512] = {0};
     int sectNumber = ShAtoi(argv[1]);
-    int nb = ShAtoi(argv[2]);
+    int nb = 1; //ShAtoi(argv[2]);
     int x = 0;
     int step = 16;
 
-    if (!sectNumber) {
+    if (sectNumber <= 0 || sectNumber > 255) {
         KernLog("Bad argument\n\n");
         return EINVAL;
     }
 
     if (!nb) nb = 1;
 
-    KernLog("Sector number: %d\n", sectNumber);
+    KernLog("Sector begin: %d\n", (sectNumber - 1)*512);
 
     IoReadATA(sector, nb, sectNumber);