Toshiba has confirmed that one of the U.S. based servers that contained customer registration information of Toshiba America Information Systems, Inc. (TAIS), a U.S.-based Toshiba Group company, was recently illegally hacked.

The company's web site was not accessible earlier this week. Toshiba said that "a limited amount" of personal information was stolen, including a small number of e-mail addresses. On discovering the intrusion TAIS immediately took the server offline and initiated an investigation.

Toshiba added that that hacked server's database included information on 7,520 of TAIS's customers, but did not contain such personal data as financial information or credit card and social security numbers. To date, TAIS's investigation has confirmed data theft of e-mail addresses and passwords affecting 681 customers.

TAIS has already alerted the relevant customers of the breach and that their data may have been compromised.