Despite North Korea's traditionally strict isolationism, K-pop has managed to reach a North Korean audience. While consumption of South Korean entertainment is punishable by death in North Korea, it has still become increasingly more available with the global rise of technology and the implementation of underground smuggling networks over the past decades. The popular flash drive technology containing K-pop and K-dramas was preceded by the use of DVDs burned with such content. Because North Korean law enforcement had figured out how to catch people consuming the media from DVDs, few people accessed the K-pop and K-dramas. Many North Koreans considered the risk too great, so it was not until the proliferation of the flash drives that it hit common homes. Utilizing the increasingly sophisticated smuggling networks, several thousands of USB drives and SD cards containing K-pop and K-dramas have been distributed and sold through care packages and the black market. Some South Korean humanitarians have also deployed drones and balloons carrying these flash drives in order to make the media more accessible. In fact, access to USB drives and SD cards exponentially rose from 26% to 81% in from 2010 to 2014 largely due to development in technology, with a large majority containing South Korean music and dramas. The expanding technology capabilities allowed the flash drives to be accessed by a wider North Korean audience. Flash drives that used to cost upwards of US$50, can now be purchased for under $10, making them more affordable and easier to send into North Korea. The content on these USB drives and SD cards are then viewed by plugging the device into a notel, a small portable media player. Although this practice had originally begun with banned books and simple radios, there is now an even higher demand for South Korean media following the cultural phenomena of hallyu, or the Korean Wave.