Install Raspberry Pi img using OSX

Up to now I have used win32Diskimager.exe in a windows VM to program images onto SDCards for the Raspberry Pi. For some reason having not done this for a while it has stopped working for me, so I decided to program using OSX directly.

Downloading

Firstly I downloaded and unzipped the raspbian image in my Downloads folder, the image I downloaded and unzipped contained 2016-02-09-raspbian-jessie.img.
In the terminal on the mac

cd ~/Downloads
ls -l *.img

this showed
rwx—— 1 davidcozens staff 4127195136 20 Feb 13:11 2016-02-09-raspbian-jessie.img

Programming the SDCard

I inserted the SDCard into a USB card reader (The internal reader on my MBP didn’t recognise the card), then to identify which device OSX had mounted this as

diskutil list

The output looked like

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage Macintosh HD            999.7 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.1 MB   disk0s3
/dev/disk1 (internal, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           +999.3 GB   disk1
                                 Logical Volume on disk0s2
                                 A8176DD4-96DB-4F64-B013-EAA7D075A63B
                                 Unencrypted
/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *8.0 GB     disk2
   1:             Windows_FAT_32 boot                    62.9 MB    disk2s1
   2:                      Linux                         4.1 GB     disk2s2
/dev/disk3 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        +1.6 TB     disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:                  Apple_HFS Time Machine Backups    1.6 TB     disk3s2
/dev/disk6 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                                                   *613.9 KB   disk6
Now BE VERY CAREFUL to identify the device corresponding to the SDCard. Using the wrong device name in the commands below could erase all of the data on your MAC. Look for the size that matches your SDCard. In my case /dev/disk2 is the SDCard, disk0 and disk1 are the internal HD on my MAC and disk6 is may backup device.
In the commands below I use /dev/diskx to represent the SDCard device name.
Unmount the SDCard

diskutil unmountDisk /dev/diskx

zero out the partition table

sudo dd if=/dev/zero of=/dev/rdiskx bs=1024 count=1

Program the SDcard

sudo dd if=2016-02-09-raspbian-jessie.img of=/dev/rdiskx bs=4m

ensure all data is synced

sync

You should now be safe to remove and use the SDCard.

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