The hard disk is typically the fastest and largest in terms of data, for example 40 -80 GB storage device in a PC. It is the main storage device and is found inside the System Unit.
Talk: Forgotten ChurchyardsBlaenavon World Heritage CentreTue, 21 May 2013
Family Nature DetectivesBlaenavon World Heritage CentreTue, 28 May 2013
Talk: Life on the Dole in Monmouthshire before 1834Blaenavon World Heritage CentreTue, 11 Jun 2013