the same effect (though the range may not be as long as a typical remote control's). Some HTPCs, such as the Plex/Mac Mini combination, support programmable remote controls designed for a wide range of typical home theater devices. More recent innovations include remote-control applications for Android and Apple iOS smartphones and tablets. External and networked storage devices Because of the nature of the HTPC, units require higher-than-average capacities for storage of pictures, music, television shows, videos, and other multimedia. Designed almost as a 'permanent storage' device, space can quickly run out on these devices. Because of restrictions on internal space for hard disk drives and a desire for low noise levels, many HTPC units use a NAS (Network Attached Storage) device, or another type of network-connected file server. TV tuner cards A TV tuner card is a computer component that allows television signals to be received by a computer. Most TV tuners also function as video capture cards, allowing them to record television programs onto a hard disk. Several manufacturers build combined TV tuner plus capture cards for PCs. Many such cards offer hardware MPEG encoding to reduce the computing requirements. Some cards are designed for analog TV signals such as standard definition cable or off the air television, while others are designed for high-definition digital TV. Network TV tuner A network TV tuner or TV gateway is a TV server that converts TV signal from satellite, cable or antenna to IP. With multiple TV tuners, the TV gateway can stream multiple TV channels to devices across the network. Several TV gateway manufacturers build the device to stream the entire DVB stream, relying on the host player device to process the feed and to capture/record, while other devices such as VBox Home TV Gateway provide a variety of option from full PVR and live TV features, to streaming of specific DVB layers to support less powerful devices and to save network bandwidth. Quiet/minimal noise A common user complaint with using standard PCs as HTPC units is background noise, especially in quieter film scenes. Most personal computers are designed for maximum performance, while the functions of a HTPC system may not be processor-intensive. Thus, passive cooling systems, low-noise fans, vibration-absorbing elastic mounts for fans and hard drives, and other noise-minimizing devices are used in place of conventional cooling systems. Software HTPC options exist for each of the major operating systems: Microsoft