In 2014, Sony successfully created a cassette tape that smashed a previous record for data storage. The cassette tape, according to the company, was capable of storing 185 TB of data, or 148 GB per square inch. Just to put things into perspective, 185 TB is equivalent to 2,960 units of iPhone X 64GB variant, or about 3,700 Blu-ray discs.

The cassette tapes were developed with the help of IBM. In case you’re wondering, Sony’s cassette tape broke the record set by a tape made by Fujifilm and IBM in 2010. Fujifilm’s tape was capable of holding a 35 TB in comparison.