diff -up hdparm-9.27/hdparm.c.sec_timeout hdparm-9.27/hdparm.c
--- hdparm-9.27/hdparm.c.sec_timeout	2009-12-11 12:48:43.000000000 +0100
+++ hdparm-9.27/hdparm.c	2009-12-11 12:47:48.000000000 +0100
@@ -137,7 +137,7 @@ static int	please_destroy_my_drive = 0;
 
 const int timeout_12secs = 12;
 const int timeout_5mins = (5 * 60);
-const int timeout_2hrs   = (2 * 60 * 60);
+const int timeout_12hrs   = (12 * 60 * 60);
 
 static int open_flags = O_RDONLY|O_NONBLOCK;
 
@@ -767,7 +767,7 @@ do_set_security (int fd)
 			err = errno;
 			perror("ERASE_PREPARE");
 		} else {
-			if ((do_taskfile_cmd(fd, r, timeout_2hrs))) {
+			if ((do_taskfile_cmd(fd, r, timeout_12hrs))) {
 				err = errno;
 				perror("SECURITY_ERASE");
 			}