Co-founder Richard Egan and his wife file to sell 10.1 million shares of stock in the storage maker.
Techs lose their upward momentum .
The Nasdaq falls below the 2,300 mark at midday, unable to continue the previous session's stellar gains. Redback CEO's departure sparks selling . Redback Networks falls 7 percent after its CEO's resignation sparks a round of downgrades. America Online raises rates . Visual Data Reports Second Quarter Results .