What's Revving Up Disk Drives

For a 50-year-old company that once dominated the market for TV gear, Ampex (AXC) is having a long overdue rebirth. Its shares, languishing at 3 to 4 in January, have zoomed to nearly 12. The big push came in April when investors got wind of the company's proprietary technology called "keepered media," which increases the speed and data-storage capacity of hard-disk drives.

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