On-the-go USB drives
An on-the-go USB drive is a relatively new type of drive that is designed to be used with mobile devices, and primarily those that might not feature a microSD card slot. They started off for Android devices, but models are now available for iOS as well. The prerequisite is that your device must support on-the-go or (OTG) drives (Android devices over version 3.1 should be okay).
An on-the-go drive has two ends to it: one end is a regular USB port, while the other end is a port (micro-USB for Android or Lightning for iOS) that can fit into your mobile device. This means that you can plug the OTG drive into your computer to load content, and then plug the drive into your phone to access that content directly. A supported app or a third-party file manager will need to be installed on your device to access the OTG drive.
For Android devices, an OTG drive will draw power from the device, while for iOS devices, the OTG drive will have its own internal battery, meaning it will have to be charged from time to time.
These drives aren't for mass storage like portable external hard drives. Instead, they are a flash-based drive that can be used as a convenient way to get content on and off mobile devices.
Read our reviews of storage devices
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• Western Digital My Passport Wireless (2TB) review
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• Verbatim Store ‘n’ Go OTG USB Drive review
• Strontium Nitro On-The-Go USB review