Formatting SD guide (Mac) (#1763)

* add formatting-sd-(mac)

Unfinished, needs steps for Yosemite/10.10 and before.

* formatting-sd-(mac): steps for <=10.10

* formatting-sd-(mac): link to correct linux page

* formatting-sd-(mac): allow any volume label

_pages/en_US/formatting-sd-(mac).txt

@@ -0,0 +1,63 @@
+---
+title: "Formatting SD (Mac)"
+---
+
+{% include toc title="Table of Contents" %}
+
+### Required Reading
+
+This is an add-on section for formatting an SD card to work with the 3DS.
+
+If the 3DS already recognizes the SD card, this guide is not required.
+
+This page is for Mac users only. If you are not on Mac, check out the [Formatting SD (Windows)](formatting-sd-(windows)) or [Formatting SD (Linux)](formatting-sd-(linux)) pages.
+
+### Instructions
+
+#### OS X El Capitan (10.11) and later
+
+1. Insert your SD card into your computer
+1. If the SD card has any files and folders on it, copy everything to a folder on your computer
+1. Run the Disk Utility app
+1. In the top-left "View" menu, choose "Show All Devices"
+1. Select your SD card in the left panel
+
+	Make sure you choose the correct device, otherwise you might accidentally erase the wrong drive!
+	{: .notice--danger}
+
+1. Click "Erase" at the top
+1. Enter anything for "Name"
+1. Ensure that "Format" is set to "MS-DOS (FAT)"
+1. Ensure that "Scheme" is set to "Master Boot Record"
+  + If "Scheme" does not appear, click "Cancel" and make sure to choose the device instead of a volume
+1. Click "Erase"
+1. Wait for the format to finish
+1. Click "Close"
+1. If the SD card had any files and folders on it before the format, copy everything back from your computer
+
+#### OS X Yosemite (10.10) and earlier
+
+1. Insert your SD card into your computer
+1. If the SD card has any files and folders on it, copy everything to a folder on your computer
+1. Run the Disk Utility app
+1. Select your SD card in the left panel
+
+	Make sure you choose the correct device, otherwise you might accidentally erase the wrong drive!
+	{: .notice--danger}
+
+1. Click "Partition" at the top
+  + If "Partition" does not appear, make sure to choose the device instead of a volume
+1. Ensure that "Partition Layout" is set to "1 Partition"
+1. Enter anything for "Name"
+1. Ensure that "Format" is set to "MS-DOS (FAT)"
+1. Click "Options" below the partition table
+1. Choose "Master Boot Record"
+1. Click "OK"
+1. Click "Apply"
+1. Click "Partition"
+1. Wait for the format to finish
+1. Close Disk Utility
+1. If the SD card had any files and folders on it before the format, copy everything back from your computer
+
+### Return to [Get Started](get-started)
+{: .notice--primary}