diff --git a/builder/virtualbox/driver.go b/builder/virtualbox/driver.go
index b6abd3473..5c131da7f 100644
--- a/builder/virtualbox/driver.go
+++ b/builder/virtualbox/driver.go
@@ -1,9 +1,11 @@
 package virtualbox
 
 import (
+	"bytes"
 	"fmt"
 	"log"
 	"os/exec"
+	"strings"
 	"time"
 )
 
@@ -46,13 +48,18 @@ func (d *VBox42Driver) SuppressMessages() error {
 }
 
 func (d *VBox42Driver) VBoxManage(args ...string) error {
+	var stdout, stderr bytes.Buffer
+
 	log.Printf("Executing VBoxManage: %#v", args)
 	cmd := exec.Command(d.VBoxManagePath, args...)
-	if err := cmd.Run(); err != nil {
-		return err
-	}
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+	err := cmd.Run()
 
-	return nil
+	log.Printf("stdout: %s", strings.TrimSpace(stdout.String()))
+	log.Printf("stderr: %s", strings.TrimSpace(stderr.String()))
+
+	return err
 }
 
 func (d *VBox42Driver) Verify() error {
diff --git a/builder/virtualbox/step_create_disk.go b/builder/virtualbox/step_create_disk.go
index 4e97dbd13..90545fb0a 100644
--- a/builder/virtualbox/step_create_disk.go
+++ b/builder/virtualbox/step_create_disk.go
@@ -27,7 +27,7 @@ func (s *stepCreateDisk) Run(state map[string]interface{}) multistep.StepAction
 	command := []string{
 		"createhd",
 		"--filename", path,
-		"--size", "40",
+		"--size", "40000",
 		"--format", format,
 		"--variant", "Standard",
 	}
@@ -52,7 +52,7 @@ func (s *stepCreateDisk) Run(state map[string]interface{}) multistep.StepAction
 
 	// Attach the disk to the controller
 	command = []string{
-		"storagectl", vmName,
+		"storageattach", vmName,
 		"--storagectl", controllerName,
 		"--port", "0",
 		"--device", "0",