The move during the final weeks of Romney's administration was legal but unusual for a departing governor, Massachusetts officials say.
The effort to purge the records was made a few months before Romney launched an unsuccessful campaign for the Republican presidential nomination in 2008. He is again competing for the party's nomination, this time to challenge Barack Obama for the presidency in 2012.
Five weeks before the first contests in Iowa, Romney has seen his position as frontrunner among Republican presidential candidates whittled away in the polls as rival Newt Gingrich, the former speaker of the House of Representatives, has gained ground.
When Romney left the governorship of Massachusetts, 11 of his aides bought the hard drives of their state-issued computers to keep for themselves. Also before he left office, the governor's staff had emails and other electronic communications by Romney's administration wiped from state servers, state officials say.
Those actions erased much of the internal documentation of Romney's four-year tenure as governor, which ended in January 2007. Precisely what information was erased is unclear.