[T(A)ILS-dev] Enhancing the erase and disk fill speed

Dear Tails developers,

a)
do you think a single shred pass (-n1) would be sufficient?
Most Forensics experts agree a single pass is OK on modern drives. In my
experience, the quicker a delete goes, the more acceptance it gets with
the users and the more often and regularly it's used. Also, the more
often it's used, the less resources can be invested by an adversary for
a single case.

b)
like above, regarding sfill: what do you think about a single sfill
pass? Now there are three ones, and they take much time.

c)
what do you think about adding a quick (and probably a bit less secure)
"fill free space" mode using dd, /dev/zero and a block size appropriate
for modern devices (e.g. 256kB to 2M). /dev/urandom has very poor
performance.