Offline storage devices

Offline storage devices

1. SD/xD cards

   • how does it work
     • Data in an SD card is stored on a series of electronic components called NAND chips. These chips allow data to be written and stored on the SD card. As the chips have no moving parts, data can be transferred from the cards quickly, far exceeding the speeds available to CD or hard-drive media.
       • They differ from other storage media in that they can be written to thousands of times and do not require power to retain their contents. This makes them an ideal choice for electronics such as digital cameras, which have strict power requirements and need media that can be written to multiple times.
   • What are they
     • An SD Card (Secure Digital Card) or XD cards(eXtreme Digital) are an ultra small flash memory card designed to provide high-capacity memory in a small size. SD cards are used in many small portable devices such as digital video camcorders, digital cameras, handheld computers, audio players and mobile phones.
       • In use since 1999, SD Memory Cards are now available in capacities between 16 Megabytes and 1 Gigabyte. An SD card typically measures 32 x 24 x 2.1 mm and weighs approximately 2grams.
   • What is it used for?
     • The SD card can be used to transfer memory, to store pictures and videos in cameras and also to store memory

2. USB's

   • How do they work?
     • They are usually inserted via a USB port
   • what are they?
     • A USB flash drive is a device used for data storage that includes a flash memory and an integrated Universal Serial Bus (USB) interface. Most USB flash drives are removable and rewritable. Physically, they are small, durable and reliable. The larger their storage space, the faster they tend to operate.