Magnetic tape, the most widely deployed archival medium today, reflects those constraints. An LTO-10 (Linear Tape-Open) cartridge, the current enterprise benchmark, holds 30TB to 40TB native at 400MB/s, but its rated shelf life is just 30 years. It requires climate-controlled storage between 16°C and 25°C and migration roughly every five to ten years.
That operational overhead, analysts say, is the real cost of tape — not the media. “Archival estates rarely fail because cartridges chemically degrade on schedule,” said Sanchit Vir Gogia, chief analyst at Greyhound Research. “They fail because compatibility windows close, drive generations evolve, firmware support sunsets, and robotics require refresh.”
Tape-as-a-service models have shifted some of that burden, noted Vishesh Divya, principal analyst at Gartner, moving hardware lifecycle management to providers under defined service-level assurances.
“LTO tape remains the benchmark for enterprise cold storage,” he said. “The media cost per terabyte remains low, the ecosystem is mature, and enterprises have decades of operational experience managing refresh cycles,” Divya said.
Sony’s Optical Disc Archive — the main optical alternative at 5.5TB per cartridge with a 100-year rated shelf life — was discontinued in March 2025, leaving no comparable product on the market.
How data is written and read from the glass
Project Silica, Microsoft’s glass-based storage initiative, uses femtosecond laser pulses to encode data as three-dimensional structures called voxels inside the glass, at 25.6 megabits per second per beam and an energy cost of 10.1 nanojoules per bit.
