I downloaded a tails iso image (800 MB via firefox 13.0)
What did you do exactly ? Was the downloading done by a background process ?
The I tested the integrity with
$>gpg --verify tails-i386-0.12.iso.pgp tails-i386-0.12.iso - it failed.
How did you ensure the computation was done after the downloading was completed ?
echo 3000 > /proc/sys/vm/dirty_writeback_centisecs
What is this supposed to do ? Does this have an effect on the synchronization between read cache and write cache ?