This Mobile rack enclosure is versatile, portable hard drive storage device. It can be separated into 2 parts;, the HD258S3A and BA258. For home use, the BA258 serves as a mobile rack to host the hard drive case, the HD258S3A. When going mobile, the HD258S3A works as an External Hard Drive by simply removing it from the bay. When used at home, insert the RE258S3A into the BA258 bay to enjoy high speed, cable-free connectivity. Hot swappable plug and play function either by internal or external use in any PC platform makes this storage device easy-to-go. With integration of home and mobile use, the RE258S3A offers a useful, innovative approach to mobile data storage.