The definition of a micro drive is a small, portable storage device that can be used to store and transport data. It is typically used in place of a traditional hard drive or flash drive, as it is much smaller and more convenient. Micro drives are typically used in digital cameras, MP3 players, and other electronic devices. They are also used to store data on computers, such as documents, photos, and music. The size of a micro drive varies depending on the device it is used in, but they typically range from 8GB to 128GB. They are also often used to store large amounts of data, such as movies or large software programs. Micro drives are an efficient and cost-effective way to store and transport data, as they are much smaller and lighter than traditional hard drives. They are also more reliable than flash drives, as they are not prone to data corruption or loss.