DECtape had fixed-size indexed blocks that could be rewritten without disturbing other blocks, so DECtape could be used like a slow disk drive.ĭata tape drives may use advanced data integrity techniques such as multilevel forward error correction, shingling, and linear serpentine layout for writing data to tape. Some computer systems ran the operating system on tape drives such as DECtape. ![]() In early computer systems, magnetic tape served as the main storage medium because although the drives were expensive, the tapes were inexpensive. As of 2018, capacities of 20 terabytes or higher of uncompressed data per cartridge were available. ![]() Magnetic tape drives with capacities less than one megabyte were first used for data storage on mainframe computers in the 1950s.
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