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If you have not already unzipped the ev3dev disk image, lets do that first.
host:~ user$ cd Downloads
host:Downloads user$ unzip ev3dev.1900MB.img.zip
Archive: ev3dev.1900MB.img.zip
inflating: ev3dev.1900MB.img
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Now, we find our SD card. Make sure that you SD card is unplugged. Then
run diskutil. You should see something like this:
host:~ user$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 249.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
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Now insert you SD card and run diskutil again. The new entry (/dev/disk1)
is your SD card. Your actual device may be named something different.
host:~ user$ diskutil list
/dev/disk0
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 249.2 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *2.0 GB disk1
1: DOS_FAT_32 LABEL 2.0 GB disk1s1
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Unmount your SD card. If it has more than one partition, you will need to do
this for each partition.
host:~ user$ diskutil unmountDisk /dev/disk1s1
Unmount of all volumes on disk1 was successful
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This is the dangerous part. If you pick the wrong device, you could wipe
out your hard drive, so BE CAREFUL!.
To make this go faster, we want to use the raw disk device, so wee need to
stick an r in front of the disk device name. In this example our SD card
is /dev/disk1, so we are going to write to /dev/rdisk1. Adjust these
values as needed. This will take some time.
host:~ user$ sudo dd if=~/Downloads/ev3dev.1900MB.img of=/dev/rdisk1 bs=4m
TIP: You can monitor the progress of this by pressing ⌃T.
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When it has finished copying, it is safe to remove your SD card.
.