Added explainations and headlines

LukeLR · LukeLR · commit 6225f8db4ff6 · 2015-07-19T14:30:34.000+02:00
diff --git a/installation/installing-images/mac.md b/installation/installing-images/mac.md
@@ -16,45 +16,48 @@ On Mac OS you have the choice of the command line `dd` tool or using the graphic
 
     Remember to replace `n` with the number that you noted before!
 
-- If this command fails, try using `disk` instead of `rdisk`:
+   - If this command fails, try using `disk` instead of `rdisk`:
     
-    ```
-    sudo dd bs=1m if=path_of_your_image.img of=/dev/diskn
-    ```
+       ```
+       sudo dd bs=1m if=path_of_your_image.img of=/dev/diskn
+       ```
 
 ## Command line
 
 - If you are comfortable with the command line, you can image a card without any additional software. Run:
 
     `diskutil list`
 
-- Identify the disk (not partition) of your SD card e.g. `disk4` (not `disk4s1`):
+- Identify the disk (not partition) of your SD card e.g. `disk4` (not `disk4s1`).
+- Unmount your SD card by using the disk identifier to prepare copying data to it:
 
     `diskutil unmountDisk /dev/disk<disk# from diskutil>`
 
     e.g. `diskutil unmountDisk /dev/disk4`
+    
+- Copy the data to your SD card:
 
     `sudo dd bs=1m if=image.img of=/dev/rdisk<disk# from diskutil>`
 
     e.g. `sudo dd bs=1m if=2015-05-05-raspbian-wheezy.img of=/dev/rdisk4`
 
-    This may result in an ``dd: invalid number '1m'`` error if you have GNU
+    - This may result in an ``dd: invalid number '1m'`` error if you have GNU
     coreutils installed. In that case you need to use ``1M``:
 
-    `sudo dd bs=1M if=image.img of=/dev/rdisk<disk# from diskutil>`
+       `sudo dd bs=1M if=image.img of=/dev/rdisk<disk# from diskutil>`
 
     This will take a few minutes, depending on the image file size.
     You can check the progress by sending a `SIGINFO` signal pressing <kbd>Ctrl</kbd>+<kbd>T</kbd>.
     
-    If this command still fails, try using `disk` instead of `rdisk`:
+    - If this command still fails, try using `disk` instead of `rdisk`:
     
-    ```
-    e.g. `sudo dd bs=1m if=2015-05-05-raspbian-wheezy.img of=/dev/disk4`
-    ```
-    or
-    ```
-    e.g. `sudo dd bs=1M if=2015-05-05-raspbian-wheezy.img of=/dev/disk4`
-    ```
+       ```
+       e.g. `sudo dd bs=1m if=2015-05-05-raspbian-wheezy.img of=/dev/disk4`
+       ```
+       or
+       ```
+       e.g. `sudo dd bs=1M if=2015-05-05-raspbian-wheezy.img of=/dev/disk4`
+       ```
 
 ## Alternative method
 
