XO-1.5 users: need your SD card data

[C. Scott Ananian]

On Thu, Apr 14, 2011 at 10:10 PM, James Cameron <quozl at laptop.org> wrote:
> As an alternative, consider identifying the unused blocks in the
> filesystem, and avoid including them in the .zd file.  This would make
> it unnecessary to know whether the bits will be set or cleared by the
> card.  ext2, ext3, and ext4 care nothing for the bits in unused blocks.

This would also nicely finesse the problem that different cards may
erase to different values (0xFF vs 0x00).
  --scott

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