diff -Naur busybox-1.2.1/miscutils/hdparm.c busybox-1.2.1-hdparm_M/miscutils/hdparm.c
--- busybox-1.2.1/miscutils/hdparm.c	2006-07-01 00:42:09.000000000 +0200
+++ busybox-1.2.1-hdparm_M/miscutils/hdparm.c	2006-09-22 05:55:29.000000000 +0200
@@ -1134,6 +1134,7 @@
 static unsigned long set_sleepnow, get_sleepnow;
 static unsigned long get_powermode;
 static unsigned long set_apmmode, get_apmmode, apmmode;
+static unsigned long set_acoustic = 0, get_acoustic = 0, acoustic = 0;
 #endif
 #ifdef CONFIG_FEATURE_HDPARM_GET_IDENTITY
 static int get_IDentity;
@@ -1765,6 +1766,17 @@
 		bb_ioctl(fd, HDIO_DRIVE_CMD, &args,"HDIO_DRIVE_CMD");
 		args[1] = 0;
 	}
+	if (set_acoustic)
+	{
+		if (get_acoustic)
+			printf(" setting AAM level to 0x%02lX (%ld)\n", acoustic, acoustic);
+		bb_ioctl(fd, HDIO_SET_ACOUSTIC, (int*)acoustic,"HDIO_SET_ACOUSTIC");
+	}
+	if (get_acoustic)
+	{
+		bb_ioctl(fd, HDIO_GET_ACOUSTIC, (unsigned long*)&parm,"HDIO_GET_ACOUSTIC");
+		printf(" acoustic     = %2ld (128=quiet ... 254=fast)\n", parm);
+	}
 	if (set_wcache)
 	{
 #ifdef DO_FLUSHCACHE
@@ -2134,6 +2146,7 @@
 		if (c == 'c') parse_opts(&get_io32bit, &set_io32bit, &io32bit, 0, INT_MAX /*8*/);
 		if (c == 'k') parse_opts(&get_keep, &set_keep, &keep, 0, 1);
 		if (c == 'a') parse_opts(&get_readahead, &set_readahead, &Xreadahead, 0, INT_MAX);
+		if (c == 'M') parse_opts(&get_acoustic, &set_acoustic, &acoustic, 1, 254);
 		if (c == 'B') parse_opts(&get_apmmode, &set_apmmode, &apmmode, 1, 255);
 		do_flush |= do_timings |= (c == 't');
 		do_flush |= do_ctimings |= (c == 'T');