> I'm guessing the problem is you've already created a file system image > which is 4G, and for which a large number of the blocks are not used, > and you're trying to optimize the amount of time it takes to flash the > image. Is that right? Yes, exactly. > The way to do that is to use a program like zerofree.c (google it, or > see attached) to make sure the non-used blocks are zero-filled, and > then use a program like make-sparse.c (see the e2fsprogs sources, in > the contrib directory) to only write the non-zero blocks to the flash > device. I see. The flash will then contain _random_ data in the non-used blocks. That is not a problem, right? One more thing. Although I have very small amount of files in my 4G image, I see that the image has almost no zero-filled blocks. Is that normal for ext4? Can zerofree.c recognize them as non-used blocks? Many thanks to those who replied. Round -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
