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Writing-the-ev3dev-Image-to-SD-Using-Command-Line-Tools-on-Mac-OS-X.md

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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.

  6. Now we want to mount the first partition so that we can edit a file in the next step.

     host:~ user$ diskutil mountDisk /dev/disk1s1
 Volume(s) mounted successfully