Toshiba Throws in Towel
In DVD-Format War

Quick Exit Lifts Stock;
Sony Ready to Push
Upgrades to Blu-Ray

By YUKARI IWATANI KANE

TOKYO -- Toshiba Corp. pulled out of the high-definition DVD business, blaming the loss of support from a key movie studio and handing victory in a format war to Sony Corp.'s Blu-ray technology.