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For questions related to the external micro-SD card used by most Android devices to increase the amount of available storage. For the internal SD card, use 'internal-sd'. See the 'storage' tag wiki for a full overview of available storage-related tags.

##What does "external-sd" describe? Android devices generally use an SD card (usually the Micro-SD format) to increase storage available for data and, as of Android 2.2, applications.

For most devices the cards are removable. Specifications for those removable cards as well as many other technical details can be found at the Secure Digital Wikipedia article.

If your device's SDCard is non-removable, it is a so-called "Internal SDCard", and you should use the tag instead. For a full overview of storage related tags, please see the tag wiki.

##Quick SDCard troubleshooting guide Flowchart SD Card Troubleshooting
Flowchart SD Card Troubleshooting by Izzy (CC-BY-NC-SA)

##Selected "core questions"