Science series. Liz asks how safe digital storage formats such as DVDs are, and looks at the Cloud. Maggie Philbin revisits phone security.

Liz finds out how safe digital storage formats such as DVDs and memory sticks are, and whether the Cloud answers all our problems. Dallas and Jem see what it takes to properly wipe your computer memory, and Maggie Philbin revisits phone security after nearly 30 years, investigating how hackers can access your smartphone.

The programme is produced in partnership with the Open University.