SAN FRANCISCO, April 30 : Memory chip maker Sandisk on Thursday reported soaring revenue and profit while predicting another rosy quarter, adding it has signed long-term contracts worth at least $42 billion to help it counter any extreme price cycles.It also said it would embark on a $6 billion buyback.

SAN FRANCISCO, April 30 : Memory chip maker Sandisk on Thursday reported soaring revenue and profit while predicting another rosy quarter, adding it has signed long-term contracts worth at least $42 billion to help it counter any extreme price cycles.It also said it would embark on a $6 billion buyback.