On February 20, Singapore police told the Financial Times that they had already examined the hard drive.
The couple, however, doubts that because the police description of the drive doesn't match the one they found in their son's apartment, they said.
The drive shows someone accessing it for only three minutes the night their son died and then again four days later, right before the parents visited his apartment for the first time, the parents said.
A forensic analysis of the drive shows someone reviewing, creating and deleting files during those two access events, the family said. That forensic analysis was conducted by a computer expert, the family said.
Singapore officials have invited the Todds to a coroner's inquest, scheduled to be held sometime this month. The parents aren't saying whether they would to return to Singapore.
Meanwhile, Max Baucus (D-Montana), chairman of the Senate Finance Committee, said his staff has met with U.S. Embassy and Singaporean officials in Singapore, and he has spoken with White House officials "to ensure this issue on their radar," a spokeswoman said.
Rick Todd had pictures taken of his son's body when it was returned to the United States.
The photos show bruises on Shane Todd's hands and a lump on his forehead, which the independent forensic pathologist said showed a fight, the parents said. The back of Shane Todd's neck was cut, the family said.
Shane Todd most likely was strangled by a wire, the pathologist told the family. Bruises also indicated that Shane Todd was trying to squeeze his hands under the wire, the family said. There was little fluid in his lungs; hanging typically takes several minutes making the lungs heavy with fluid, the pathologist told the parents.
"It's hard," Rick Todd said. "Every time I open those pictures, it's difficult.
"But we will go to the ends of the Earth to see justice is done," he said.