Most recently used "NOOBS Offline and network install".
So starting with the SD card inserted and mounted... in MY CASE ONLY, from an xterm using the df -h command, the device name (and therefore the 'raw device name') is disk1 (or rdisk1 for its raw equivalent), i.e.
$ df -h
Filesystem Size Used Avail Capacity iused ifree %iused Mounted on
/dev/disk0s2 112Gi 108Gi 3.6Gi 97% 28456655 955713 97% /
devfs 184Ki 184Ki 0Bi 100% 636 0 100% /dev
map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net
map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home
map -fstab 0Bi 0Bi 0Bi 100% 0 0 100% /Network/Servers
/dev/disk1s1 3.7Gi 832Ki 3.7Gi 1% 0 0 100% /Volumes/XBMC
Next, unmount it using 'sudo diskutil unmount /dev/disk1s1' (my case only). The icon will also disappear from the desktop confirming this step was successful.
$ sudo diskutil unmount /dev/disk1s1
The last step is to wri the image file to the raw SD card device as identified above, replacing disk1s1 with rdisk1:
$ sudo dd bs=1m if=./raspbmc-2013-12-23.img of=/dev/rdisk1
After anywhere from 3 to 5 minutes the disk image write finishes. The xterm looked like this:
1300+0 records in
1300+0 records out
1363148800 bytes transferred in 243.253827 secs (5603812 bytes/sec)
And there's a shiny new disk labelled 'Untitled' on the desktop. At first impression it looks like your 4G or 8G sized disk has tragically shrunk to 60 or 70 MB. The reason is that the SD disk now has a Linux swap partition and a Linux filesystem partition occupying the available space. The good news is that most of the slack space can be recovered the first time you load this SD card on the Raspberry Pi via one of the Pi configurator (raspi-config) options to reallocate the space from the linux partition to the FAT32 partition.
