How to create img of Android

Once I have setup and SD card with apps etc. I want to create an image of the card to replicate it. I have tried taking one using win32DiskImager with no success. It creates an image file around the size of the actual OS ie. 4GB and not an 8GB image.

I have had success cloning using 'Hdd Raw Copy' but this is copying SD to SD and is slow.

How do I create an image much like the image file provided by Udoo to install Android?

 

Did you follow the guide? Second question: QUAD/DUAL or NEO?
NEO: http://www.udoo.org/docs-neo/Getting_Started/Create_a_bootable_MicroSD_card_for_UDOO_Neo.html
QUAD/DUAL: http://www.udoo.org/docs/Getting_Started/Create_A_Bootable_MicroSD_card_for_UDOO_QUAD-DUAL.html

 

Yes I have followed those to load Android onto the SD card.

Now I have installed apps so want to take that SD card in its new state and clone it to put into 10 other devices.

The guide is about using the Udoo images, my question is around making my own image from the SD card.

I have tried the 'Read' capabilities of win32disk imager and it produced a 4gb image size not the 8 that is on there.

I am using the Udoo neo (20ish of them - hence not wanting to set them up 1 by 1)

 

In this case there's another part of the guide that may help you out http://www.udoo.org/docs-neo/Advanced_Topics/Compile_Android_From_Source.html

 

Is it posible to make it usin a Mac laptop? I mean, without using a virtual machine?

Thanks so much,

 

Yes, you can do it with a Mac.
To compile a new Android image from sources with a Mac this link will be useful to you: https://source.android.com/source/initializing.html#setting-up-a-mac-os-x-build-environment.

 

in linux: dd if=/dev/sdc of=/home/udoo.img
where /dev/sdc - your sd card
And did you try to write img received from win32diskImager to new sd card? maybe its ok?

 

Thanks too much to both! I tried creating an coping img using disk utility, but didn't work... maybe I miss something...
I will tell you about the results following Andrea's suggestion.

 

Have you had any luck with this problem?

 

Yeaah!!! finally I found the tool "applePi-Baker", and it makes so easy to make backups with .img format and to copy them in new SDs. It is so great! http://www.tweaking4all.com/hardware/raspberry-pi/macosx-apple-pi-baker/
By the time, I didn't hat luck with the command line... I supose I was making something wrong...

Anyway thank you so much for your help!!!