To that end, Redbox tracks rentals to predict the right mix of titles and the right number of copies for each location. It also lets customers go online and reserve a DVD in a specific kiosk, then pick it up in person. The $1 price may be the initial draw, but most people end up paying to keep DVDs for two or three days.

If Redbox grows into a serious challenge to Netflix, it will have done what two much larger companies, Blockbuster and Wal-Mart Stores Inc., could not.

Both tried to match Netflix’s DVD-by-mail success. Wal-Mart quit the business and gave all its customers to Netflix. Blockbuster still trails Netflix in DVDs by mail, and is also closing a growing number of unprofitable stores.

Now Redbox’s success has prompted Blockbuster to promise 10,000 DVD kiosks of its own in a deal with NCR Corp. The maker of ATMs and cash registers acquired the second-largest movie kiosk company, TNR Holdings Corp., in April.

Redbox kiosks also sell used DVDs for $7, sometimes less than two weeks after they’re available to rent, rather than the two or three months video stores usually wait. The practice irked some Hollywood studios — which may jeopardize the $1-a-day rental model that helps make Redbox so attractive.

Last year, NBC Universal’s DVD distribution arm, Universal Studios Home Entertainment, pressed Redbox to limit the number of Universal DVDs its kiosks could carry and to destroy used discs instead of selling them at cut-rate prices. When Redbox refused, Universal ordered its partners to stop selling DVDs to Redbox at wholesale prices. Redbox sued Universal for violating antitrust laws, among other claims.

The case is still underway and Redbox would not say what effect it might have on its DVD rental or resale prices. But Wedbush Morgan Securities analyst Michael Pachter bets that if Redbox loses the lawsuit, other studios could follow Universal’s lead, pushing Redbox to either agree to restrictions or buy movies at retail prices, then raise rental rates.

Universal Studios Home Entertainment did not return a call for comment.

In the era of YouTube and Hulu, video iPods, Netflix’s own streaming video service and devices that connect TVs to the Internet, storming an industry by way of supermarket vending machines seems very yesterday.

But while DVDs will someday disappear, for now the market dynamics still work for Redbox: almost 90 percent of U.S. homes have a DVD or Blu-Ray player, while only a sliver download movies to their computer or stream them from the Internet, said Russ Crupnick, an entertainment analyst for market researcher NPD Group.

Crupnick doesn’t expect streaming services to fully catch on until the technology is built into more television sets. And since many people just invested in new flat-screen TVs, it will be years before they replace them.

“Digital options and physical options can coexist,” said Crupnick. “People think there’s this balkanization — ‘Once I get Netflix, I never go to Blockbuster. Once I go to Redbox, I don’t need Netflix.’ That’s really not the way that it works in the world.”

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On the Net:

http://www.redbox.com