Lawyer David Kendall tells this to the Senate Homeland Security committee. He adds that both he and his office partner lawyer Katherine Turner had been given security clearances to handle a thumb drive containing some of Clinton’s emails, but he doesn’t say when. His comments don’t clarify if Clinton’s server was wiped or merely erased.
“Wiping” means that new data is written over the old data several times to make sure it can never be recovered. (The Guardian, 8/19/2015)