A judge has sent a man to prison for nearly two decades after officials found he was in possession of the most massive child pornography collection that has ever been seized in U.S. history.

Richard Person, 63, of Cheyenne, Wyo., has been sentenced to 19 years and seven months behind bars for keeping the pornography on computers and other devices.

The amount of images and videos kept by Person is staggering. According to the Wyoming Tribune Eagle:

...the Wyoming Division of Criminal Investigation’s Internet Crimes Against Children taskforce agent assigned to the case so far has spent more than 400 hours analyzing the child pornography possessed by Person. The agent reportedly has sent the NCMEC approximately 10 million files and is preparing to send off 8 million more....all the computing devices seized have an approximate storage capacity of 47 terabytes. For perspective, just 1 terabyte of storage can hold approximately 1,000 hours (40 days) of standard definition video or 310,000 photos.

Person, who was sentenced on Tuesday, simply told the court, “I’m very sorry to all the people I let down. I have nothing else to add to that."

Person also spent eight years in prison after he was convicted of sexually assaulting a child in 2001.

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