The rootstrust Universal 128GB Solid State Flash Drive is a specially formatted device that can be used with Windows, macOS and Linux. Everything you need resides on the flash drive. It uses the host computer’s processor and memory only. This is ideal for doing genealogy on a company computer during your lunch hour. This flash drive has not only twice the storage capacity of the 64GB model, it is also more than twice as fast. It is essentially a solid state hard drive.