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Often the partitions we extract have extra space in them, but the dd utility will still write out the excess zeros. That can mean we write out hundreds of megs of data which could otherwise be skipped. We thus waste a good amount of I/O and storage. For now, only use this flag when extracting a partition to a new file as this should be safe (there's no pre-existing data to clobber/merge). Now that the signers have been upgraded to Trusty, we can land this. BUG=chromium:530730 TEST=`./signing_unittests.py` passes BRANCH=None Change-Id: I275973ebfc028c15a8d1ef33dd9b3dcf6ca726a2 Reviewed-on: https://chromium-review.googlesource.com/306420 Commit-Ready: Mike Frysinger <vapier@chromium.org> Tested-by: Mike Frysinger <vapier@chromium.org> Reviewed-by: Amey Deshpande <ameyd@google.com>