Skip to content
TopicTracker
From HackerNewsView original
TranslationTranslation

Wireless LAN SD

SD Association defines Wireless LAN SD standards under the SDIO (SD Input/Output) specification, enabling SD card form-factor wireless networking capabilities for host devices.

Background

The SD Association's Wireless LAN SD standard lets SD memory-card slots double as Wi-Fi adapters. Instead of storing photos, a WLAN SD card adds wireless networking to any device with a standard SD slot — cameras, handheld consoles, embedded systems, or older laptops. The spec defines how the SD interface carries Wi-Fi data, covering 2.4/5 GHz bands, security (WPA2/3), and power management. It is part of the broader SDIO (SD Input/Output) standard, which allows SD slots to talk to peripherals like GPS, Bluetooth, or TV tuners. This matters because it lets hardware gain Wi-Fi without a dedicated antenna or USB dongle, reusing a ubiquitous slot. Real-world adoption, however, has been limited — most consumer devices now ship with Wi-Fi built in, so WLAN SD cards are mainly used in industrial, embedded, and legacy-device scenarios.

Related stories