I would like to be able to backup my images using Win32DiskImager OR FlashNul. I have not been able to using two Kingston SDHC SD4\8GB cards. I have tried them using two different readers (one attached to a laptop and the other is an external card reader).
I am able to write the 2013-02-09-wheezy-raspbian.img image file to both using both readers, but when I turn around on a fresh image and try to Read the file to disk using Win32DiskImager, it will get to 1% and then will give me a Read Error - Error 23: Data error (cyclic redundancy check). When I use the external SD reader, what I believe is happening is that it will read the FAT partition of the card, but it cannot read the second ext4 partition. Windows does not recognize it either. When it tries to read the second partition (I believe that is how it is setup, right?), on my external card reader, the light will shut off and the card reader stops reading. There isn't a light in my laptop card reader, but it acts the same way, where after the first partition (first 1% of the card), it dies on me.
My final goal is to be able to backup my images (because I'm having some other problems with Raspbian and the RPi), but I'm unable to do it using any windows software at this point. I know that the Win32DiskImager developer checks in here, so hopefully this provides more information to fix the problems I'm experiencing, and others have reported as well.
In the meantime, has anybody been able to overcome this issue? I've ordered replacement cards since these Kingston cards are reported to have problems with the upgraded version of Raspbian according to the hardware compatibility wiki, but I'm not sure if just swapping out cards will solve my problem.