Linear Tape-Open (or LTO) is a computer storage magnetic tape format developed as an open alternative to the proprietary Digital Linear Tape (DLT). The format was developed and initiated by Certance, Hewlett-Packard, and IBM. An implementation of the LTO tape format goes by the name, Ultrium . Current manufacturers of LTO tape drives are IBM, Hewlett-Packard, Certance, Qualstar and Tandberg Data.

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