USB flash drives are a very cost-effective choice. These drives are used for data transfer and taking backup between systems. They operate fast and are resistant to shocks. They can be easily attached and detached from the USB ports of any kind of laptop or desktop. Custom USB flash drives have a massive storage capacity ranging from 1 GB up to 128 GB. These re-writable flash drives can be carried everywhere in your pockets and backpacks. They are designed in a way to keep them away from dust and scratches.