Seagate Technology LLC has shipped Maxtor disk drives that contain Trojan horses that upload data to a pair of Chinese Web sites, the Taiwanese government's security service warned this weekend.

The Investigation Bureau, a part of the Ministry of Justice that's responsible for both internal security and foreign threats, said it suspected mainland China's authorities were responsible for planting the malware on the drives at the factory. "The bureau said that the method of attack was unusual, adding that it suspected Chinese authorities were involved," a story posted by the English-language Taipei Times reported Sunday. "Sensitive information may have already been intercepted by Beijing through the two Web sites, the bureau said."

Seagate confirmed today that some Maxtor Basics 3200 drives were infected out of the box, but the company said it had no proof that the Chinese government was involved. "We discovered that a contract manufacturer had introduced a virus onto the drives during assembly," said Forrest Monroy, a Seagate spokesman, in an e-mail. "We have no indication, nor any reason to believe, that there is any government involvement in the virus issue."

According to the newspaper, about 1,800 Seagate-made drives left a Thailand facility with a pair of Trojan horses preinstalled. The two Trojans, said the Investigation Bureau, "phone home" to a pair of Web sites hosted in Beijing and report all data recorded on the compromised drive. Seagate, however, countered that the only data captured by the on-disk Trojans and sent to the Chinese Web sites were game-related passwords.

Internet records show that both sites -- www.nice8.org and www.we168.org -- were registered with XinNet.cn, one of China's largest domain registrars. Much of the registration information, however, including the contact name and mailing address, appears to be bogus.

The Investigation Bureau identified the infected drives as 500GB models and has demanded that the Taiwanese distributor pull all units from shelves. Of the 1,800 drives reportedly malware-equipped, 1,500 have been removed from the sales channel. The remainder had already been sold.

Seagate claimed that as soon as it discovered the infections, it put a "stop ship" order on all units leaving the factory. "The drives leaving the facility are [now] clean," Monroy said. But because some infected drives are in customers' hands, Seagate will post a 60-day trial version of Kaspersky Labs' antivirus software on its Web site. Users should scan any suspected Basics 3200 drive for the malware, Monroy advised. "Seagate apologizes for any inconvenience this may have caused our customers," he added.

This is not the first time that the government of mainland China -- the People's Republic of China -- has been accused of cyberspying or other computer hacks and attacks. Two months ago, it was fingered for hacks on U.S. military networks, and in May a U.S. Defense Department report said that China has beefed up its own armed forces' first-strike cyberattack capabilities.