Right now there are more than 150,000 used smartphones, tablets and laptops for sale on eBay. And in the hands of a hacker, any number of them could reveal crucial data about a former owner--even after it's been deleted. "People think if they do a disk-drive reformat, there's nothing on it," says Rob Schafer, a tech analyst at the research firm Gartner. "That is a trivial thing to get around if you are a professional data thief." Or even an amateur, like the McAfee employee who made news last year (as part of an awareness campaign) by mining credit-card information from...
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