First download a Raspbian RAW image from here: http://www.raspberrypi.org/downloads
Plug-in your SD card into your Mac. Then use diskutil to see the name of the disk device of it:
$ diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *320.1 GB disk0 1: EFI EFI 209.7 MB disk0s1 2: Apple_HFS Macintosh HD 319.2 GB disk0s2 3: Apple_Boot Recovery HD 650.0 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: FDisk_partition_scheme *4.0 GB disk1 1: Windows_FAT_32 4.0 GB disk1s1
In my case it is /dev/disk1.
Unmount it so we can write the image into it:
$ diskutil unmountdisk /dev/disk1 Unmount of all volumes on disk1 was successful
Now copy the image (it will take quite long and you won’t get any feedback until the end so be patient):
$ sudo dd if=2013-09-25-wheezy-raspbian.img of=/dev/disk1 bs=1m 4297+0 records in 4296+0 records out 2199552 bytes transferred in 1.877077 secs (1171796 bytes/sec)
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