Thanks for the help Jeff!
I'm not quite out of the woods just yet.
I first used gunzip to unzip the file (2gbsd-latest.dd.gz), as you suggested,
which left me with '2gbsd-latest.dd'.
Then I used: "sudo dd if=2gbsd-latest.dd of=/dev/sdb bs=32k" (and also without
the "bs=32k").
But I keep getting the message: dd: writing to `/dev/sdb': No space left on
device
It is a 2GB micro-SD card, and this image from TS suggests it is meant for that
size card, so I'm not sure why it's not working. Thoughts?
Thanks!
--- In "jeffs7283" <> wrote:
>
>
>
> --- In "drex459" <dexterjagula@> wrote:
> >
> > I'm pretty new to working in UNIX, and have to do some development on the
> > TS-8390-4700 board. Before I get started I have to use an image provided by
> > TS. I need some help backing-up an existing micro SD card, and "dropping"
> > an imagine onto the same micro-SD card.
> >
> > Here is a summary of what I have to do:
> > 1. Back-up the existing micro-SD card (that came with the TS-8390-4700
> > board).
> > 2. "Drop" a downloaded image onto the micro-SD card.
> > 3. If necessary, how to revert the micro-SD card to the backed-up image.
> >
> > Here's where I am, and what I still have to do:
> > 1. Using the "sudo fdisk -l" command, I was able to see that the micro-SD
> > card had a few partitions on it (/dev/sdb1, /dev/sdb2, /dev/sdb3,
> > /dev/sdb4). I then used the command "sudo dd if=/dev/sdb of=sd.iso", which
> > returned the following result:
> > 3862528+0 records in
> > 3862528+0 records out
> > 1977614336 bytes (2.0 GB) copied, 505.756 s, 3.9 MB/s
> > which looks like it got backed-up successfully to the .iso file. Is this
> > the best way to back-up/image the micro-SD card, so that I can revert ALL
> > files and partitions to the way it was?
> >
> > 2. The image I require is:
> > "ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4800-linux/binaries/ts-images/2gbsd-latest.dd.gz";
> > Once downloaded, how can I extract this image and "drop" it on the
> > micro-SD card? Can I use the 'dd' utility to do this? Or some other
> > utility? Do I have to format the micro-SD card first?
> >
> > 3. If I want to revert the micro-SD card back to the way it was before I
> > "dropped" the image onto it, how do I do that using the .iso type (or any
> > file type) using the 'dd' utility?
> >
> > These questions may seem basic, but any help would be greatly appreciated!
> > Thanks in advance!
> >
>
> So far I think you've got it. 'dd' is the right utility for doing straight
> binary copy from one file/device to another. Since your card is showing up
> on /dev/sdb, after step 1 above you now have the original card image backed
> up in the sd.iso file. This includes the MBR on the card and can be used to
> restore the card image by using dd again in exactly the same way: "dd
> if=sd.iso of=/dev/sdb bs=32k" Setting the block size to 32k is a
> performance enhancer when writing to the card.
>
> For (2), writing a downloaded image to the card, you must first gunzip the
> downloaded file. Also note that you need to match the SD card size to the
> image. Don't try to put an 8Gb image on a 2 gig card and vice versa. Then
> it's just "dd if=<downloaded unzipped image> of=/dev/sdb bs=32k" to load it
> on the card. Note that it takes a loooooong time to write to an SD card this
> way, so be patient. Since you are writing a complete filesystem image to the
> card including the MBR there is no formatting necessary. Just plug in a card
> and go.
>
> For (3) see step one above, just write your original sd.iso image back onto
> the card with dd.
>
> Things to remember:
>
> dd is a very low level operation, no formatting or partitioning of a card is
> necessary to use it.
>
> Use the block size (bs=32k) parameter to improve performance when writing to
> sd cards. Leave this off when saving image from the card to disk.
>
> Match downloaded binary image size to card size. Note that the downloaded
> binary image is usually about 10% smaller than the size of the card in order
> to allow for the size of the card to shrink slightly over time due to sectors
> wearing out.
>
> Be sure to unzip downloaded images prior to writing to SD card.
>
> -Jeff
>
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