Difference between revisions of "RPi Noob Guide to the Pi image"
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== Ubuntu ImageWriter ==
== Ubuntu ImageWriter ==
== Win32DiskImage ==
== Win32DiskImage ==
Revision as of 09:24, 12 August 2012
Page in development so far just layout
The intention of this page is to provide the detail of making a working SD card for a RaspberryPi keeping instructions and explanations jargon free as much as posible and explaining any neccessary jargon as it appears.
Getting an image
What is an image.
An image is a file you download that contains the bare minimum to setup a RaspberryPi SD card. The SD card is that bit of plastic you can put in your camera to store pictures and it is more than capable of acting as the primary disk for your RaspberryPi
The absolute minimum to load a Wheezy image is a 2 Gig (Gigabyte) SD card (there are images that will fit on a 1 Gig but not Wheezy) but you will not have much space so I reccomend a 4 Gig and as a noob have two if you can.
You can move to bigger ones later I started with a 2 Gig I extracted from an old camera and a 4 Gig I scrounged from an old MP3 player
If you have a camera that takes SD cards use the cameras format option its quick and usually works.
Ok most of this page will work around the Wheezy images but should work for any image but your going to need to get an image.
The Wheezy image at this time has two versions and each has two download methods
The older version Wheezy 2012-06-18 Beta is available here
The current one Wheezy-Raspbian-2012-07-15 is on the main download page here
Both give the option of a direct browser download or a download using Torrent.
Torrent is better for the community if you know how to use it but if you do not just let your browser do the work and take the Direct Download either way you will end up with a zip file.
Do not unzip yet you need to do a check on this zip file before you unpack (unzip) it.
The checksum and using it
On the download page you will see a long string with the name SHA-1 this is the checksum if you think any computer file is a sequence of numbers if you were to add all of those together you would get a result an answer.
Get one of the numbers wrong and the answer is wrong well the SHA-1 is a hexadecimal (base16) total for the zip file you downloaded.
This is actually a lie SHA1 is actually a fancy algorithim called a Secure Hash Algorithm but of which there are four. As a noob don't worry it is all done for you.
There is a little program SHA1SUM.exe that if you feed it your zip file will calculate an SHA-1 number and if that number is the same one on the download page you can be confident the download worked correctly.
A simple place to get sha1sum.exe this is cute because it comes with its own SHA1 checksum.
Highlight and copy the checksum create a new text file (I use wordpad) and paste the checksum into it, it may add some leading space so delete that highlight and copy it with the leading spaces removed save the file and when asked for the file name paste in the checksum followed by .txt
you now have a text file that has the checksum as the name and it contains the checksum this is slightly safer than writing it down. Also if you feel inclined it is easy to print a hard copy.
So you should now have copy of sha1sum.exe and a copy of its checksum
Double click sha1sum.exe you should get a pop-up window (you may get the unknown publisher one first and if you are running vista or Windows7 you will need to run as administrator)
The resuting window has two boxes and two buttons [select file] and [exist] (an unusual spelling of exit) click select file and browse to yor sh1sum.exe file and click. There should now be the file name in the top window and a value in the bottom window and because you used the checksum as a file name it will be fairly easy to compare the two if they are the same then you know sha1sum.exe is good.
So you now need to do the same for your downloaded image zip file. (NOTE the zip file not the extracted image file). it may be worth doing the little text file trick for your Wheezy image sha1 check value.
This is where this may sound patronising but remember each file has its own sha1 value.
If the values come out the same you can be confident the download was a sucess and it will be safe to unzip the downloaded file.
Unzipped you will end up with a file that ends .img this is the file you are going to build into your SD card but first you need a program to do this.
Image writers are programs used to stuff a .img file onto an SD card or a pen drive.
There are two options in Linux
dd which is command line and not the easiest for the noob feel free to investigate but the following is the command line description for running dd
dd bs=1M if=[debian .img file] of=[path to your SD card]
There is a gui tool under the Ubuntu banner called ImageWriter (To use this you will need to add this into Ubuntu and it can be found in the Ubuntu Software Centre under Accessories) This is intuitive compared to dd.
One easy one for Windows
This is Win32DiskImage there are a number of locations you can get this
Win32DiskImage Note this kicks off an automatic download of the zip.
This is the same download you will get by following the link on the RaspberryPi Download page. This should work for all versions of windows but you should note that as usual that in Vista and Windows7 you will need to run as administrator. I have been told there is a special version for 64bit instalations but there appears to be no obvious link for this.
Various Mac options you can find here
I make no pretentions to know how to do this onna Mac I hope we can find a Mac punter to come and expand on the Mac options maybe even write its own dedicated wiki page for the Mac noob.
I am not going to pretend that the linux command line and the dd method is the easiest environment for a noob.
The following link to dd is the wikipedia page for dd this is a comprhensive page that has the answers but I would suggest that you save this for the time when your RPi is running and you can play with it there.
The Ubuntu ImageWriter is as instinctive as it gets if you are working from a Linux Desktop I need to confifm other Distro's (Distributions = Flavours of Linux)
Power to the RPi
USB 1 & 2
The SD Card slot
Hey look LED's
The tidy shutdown
Backup your work