TOKYO - Japanese electronics maker Toshiba might withdraw its HD DVD next-generation video format, Kyodo News agency reported Saturday.

The report cited unidentified individuals from the industry as saying Toshiba Corp. is reviewing its operations, with the timing of the withdrawal to be decided later, depending on U.S. demand for its HD DVD products and other factors.

Calls went unanswered at Toshiba Corp.'s Tokyo office, which was closed for the weekend.

HD DVD has been competing against the Blu-ray technology, backed by Sony Corp., other makers and five major Hollywood movie studios.

Recently the Blu-ray disc format has been gaining market share, while Toshiba has been forced to slash prices to sell its HD DVD machines. A Toshiba pullout would signal the almost certain defeat of HD DVD to Blu-ray.

On Friday, Wal-Mart Stores Inc., the largest U.S. retailer, said it will sell only Blu-ray DVDs and hardware and no longer carry HD DVD offerings.

The announcement came five days after Netflix Inc. said it will cease carrying rentals in HD DVD. Several major U.S. retailers have made similar decisions, including Target Corp. and Blockbuster Inc.

Last month, Warner Bros. Entertainment decided to release movie discs only in the Blu-ray format, becoming the latest studio to reject HD DVD.

Warner Bros., owned by Time Warner Inc., had been the only remaining Hollywood studio releasing high-definition DVDs in both formats.

Both formats deliver crisp, clear high-definition pictures and sound, but they are incompatible with each other, and neither plays on older DVD players.

Only one format has been expected to emerge as the winner, much like VHS trumped Sony's Betamax in the video format battle of the 1980s.