They did not understand enough of the technology to know that "delete"
really only removes the pointer to the data. The data will stay until
they reuse the space. In that regard, bigger is not better on a hard
drive because those sectors may not get reused very quickly on a big
drive. The unanswered question is, what else did they find on that
drive. Comey said they only concentrated on national security secrets,
not criminal secrets. Who knows what illegal collusion they may have
uncovered that was not within the narrow scope of this investigation.
I am sure it will come out in a FOIA request or simply be leaked.
Unfortunately this will happen after the election ... but the
Watergate facts did not come out until after the election. We know how
that worked out.
I would be willing to bet than neither Hillary or Trump would survive
4 years without being impeached.