Dell Inc [DI.UL], the world's third largest personal computer maker, is in talks to buy data storage company EMC Corp , a person familiar with the matter said, in what could be one of the biggest technology deals ever. A deal could be an option for EMC, under pressure from activist investor Elliott Management Corp to spin off majority-owned VMware Inc . The terms being discussed were not known, but if the deal goes through it would top Avago Technologies' $37 billion offer for Broadcom .