SD cards are used as memory storage devices for cell phones, digital cameras, and personal computers. They are often the size of a postage stamp, or smaller. An SD card holder can be used to store memory cards when not in use. Choosing the best SD card holder will usually depend upon the size of the SD card and the number of cards that must be stored.
Different SD cards can be used to keep photos and information organized. When not in use, they need to be stored in an SD card holder that is free from debris and moisture-resistant. An SD memory card will often have a small bit of metal visible on its exterior. This metal is the contact point between the card and the corresponding digital device. If these metal contacts are damaged by debris or water, they may not work and information may not be accessible.
The number of SD cards that need to be stored will typically determine the size of the SD card holder. The smallest models can be carried on a key chain, with larger versions being sold as small flip books or plastic cases that snap closed. Key chain holders and snap cases most often hold only one SD memory card. Flip cases can hold two or more SD cards, and range in size. Smaller flip cases are often the size of business cards, with larger cases resembling small address books.
Micro-SD cards are most commonly used in cell phones. These are very small and may require an adapter to be used with personal computers, which can pull data from the cards. Micro memory card cases may include a slot for the micro-SD card and the adapter. Most often, the adapter is the size of a standard SD card.
Hard SD card cases can also be purchased to hold up to 12 SD cards. These are generally created from hard, molded plastic and feature a zip enclosure. Inside, plastic sheets are used to separate the SD cards. These cases are ideal for storing a large number of memory cards. The plastic can be marked to identify the data stored on each card.
Some SD card storage containers serve a dual purpose as a card holder and a card reader. These devices can store SD cards and connect to a personal computer by use of a USD cable. Cards can then be read, and information pulled from card memory, while remaining in the SD card holder.