Another study, performed by CERN over six months and involving about 97 petabytes of data, found about 1.2 × 10-9 of involved data (or about 116 gigabytes) becoming permanently corrupted.
In May 2013, Microsoft announces that as part of their migration of Hotmail accounts to the new Outlook.com email system, they'd migrated over 150 Petabytes of user data in six weeks.