This is a two-part detailed technology presentation on LTO, erasure codes, and archival storage. In the first part, we will cover core LTO technology by reviewing areal density roadmaps, physical and logical LTO formats, and data durability for long-term archival applications including environmental requirements. In the second part, we will discuss new two-dimensional erasure-coded tape for durable and available long-term data storage where random access is used. Tape has recently reemerged as the lowest cost medium for different levels of cold data in archival data storage.