Nintendo remained the lone hold-out, using cartridges for their Nintendo 64 system; the company did not transition to optical media until the release of the GameCube in 2001. Cartridges were also used for their handheld consoles, which are known as Game Cards in the DS/3DS line of handhelds.
Nintendo remained the only one using cartridges for its Nintendo 64 console; it wasn't until the launch of the GameCube in 2001 that the company made the switch to optical media. Similarly, cartridges were used for their portable devices, which are known as Game Cards within the DS/3DS family of handhelds.