PORTLAND — As many as 267,000 TD Bank customers from Maine to California were affected by the loss of two data backup tapes that contained personal information such as Social Security numbers and driver’s license numbers. In Maine, 34,907 residents were affected, according to a letter the bank sent to the attorney general.

The unencrypted tapes were lost more than six months ago, but TD Bank did not alert attorneys general in affected states until this week. The loss of data affects bank customers in at least six states, and may include names, addresses, dates of birth and account numbers.

“Is six to seven months as expeditious as possible? There may be a valid reason, but it does seem long on the face of it,” said Dan Mitchell, an attorney with Bernstein Shur in Portland and a member of the data security practice for the law firm, which is not involved in the data loss. “It’s not a common thing to lose that much information for that many customers.”

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