How to connect external USB storage to your Android phone using OTG cable
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In this video I will connect external USB Flash drive to my Lenovo K3 Note using OTG cable and access files.
USB On-The-Go, often abbreviated to USB OTG or just OTG, is a specification first used in late 2001, that allows USB devices such as digital audio players or mobile phones to act as a host, allowing other USB devices like a USB flash drive, digital camera, mouse, or keyboard to be attached to them. Use of USB OTG allows these devices to switch back and forth between the roles of host and client devices. For instance, a mobile phone may read from removable media as the host device, but present itself as a USB Mass Storage Device when connected to a host computer.
In other words, USB On-The-Go introduces the concept that a device can perform both the master and slave roles – whenever two USB devices are connected and one of them is a USB On-The-Go device, they establish a communications link. Whichever device controls that link is called the master or host, while the other is called the slave or peripheral. Standard USB uses a master/slave architecture; a host acts as the master device for the entire bus, and a USB device acts as the slave. Devices are designed from the start to act in one role or the other – computers are generally set up to be hosts, while printers (for instance) are normally slaves.
When a device is plugged into the USB bus, the master device, or host, sets up communications with the device and handles service provisioning (the host's software enables or does the needed data handling such as file managing or other desired kind of data communication or function). The host is responsible for all data transfers over the bus, with the devices only able to signal, when polled, that they require attention. To transfer data between two devices, from a phone to a printer for instance, the host first reads the data from one device then writes it to the other. This allows the devices to be greatly simplified compared to the host; a mouse, for instance, contains very little logic and relies on the host to do almost all of the work.
While the master/slave arrangement works for some devices, there are many devices that might want to act as a master or a slave depending on who else shares the bus. For instance, a computer printer is normally a slave device, but when a USB flash drive of images is plugged into the USB port of the printer with no computer present (or at least turned off) it would be useful for the printer to take on the role of host, allowing it to communicate with the flash drive directly and print images from it.
USB On-The-Go introduces the concept that a device can perform both the master and slave roles, and so subtly changes the terminology. With OTG, a device can be either a host when acting as the link master, or a peripheral when acting as the link slave. The choice of whether to be host or peripheral is handled entirely by which end of the cable the device is plugged into. The device connected to the "A" end of the cable at start-up, known as the "A-device", acts as the default host, while the "B" end acts as the default peripheral, known as the "B-device".
After initial startup, setup for the bus operates as it does with the normal USB standard, with the A-device setting up the B-device and managing all communications. However, when that same A-device is plugged into another USB system, or a dedicated host becomes available, it may become a slave.
USB On-The-Go does not preclude using a USB hub, but it describes host/peripheral role swapping only for the case of a one-to-one connection where two OTG devices are directly connected. Role swapping does not work through a standard hub, as one device will act as the host and the other as the peripheral until they are disconnected.
Lenovo chose to unveil an affordable midrange phablet. The new smartphone is called Lenovo K3 Note, and its a larger, better-equipped version of the existing Lenovo K3. It comes with a 5.5-inch FullHD display and rocks a fresh yellow paintjob with a distinctive circular bump on the back - purely a design element. The smartphone is powered by a 64-bit Mediatek MT6752 chipset, and an octa-core processor ticks inside at 1.7GHz. 2GB of RAM are on board and internal storage is 16GB, expandable by up to 32GB via microSD. A 13MP camera sits on the back, coupled with a dual-tone LED flash, while a 5MP front snapper take care of selfies. It comes with dual-SIM dual-standby capability and SIM1 supports 2G/3G and LTE, while the second slot is GSM-only. The engineers have managed to fit a 3,000mAh battery in a body just 7.6mm thin, while weight has been kept at around 150g.
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