Magnetic tape may look like a relic next to SSDs approaching 256TB and hard drives holding more than 40TB, but the 25-year-old Linear Tape-Open format is still advancing. The current LTO-10 generation holds up to 40TB of uncompressed data per cartridge, and the companies behind the LTO Program, HPE, IBM and Quantum, now plan for LTO-14 cartridges with a native capacity of 365TB.
The format began in 2000 with LTO-1, which held 100GB and moved data at 20 MB/s. Later generations brought 200GB, 400GB, 800GB, 1.5TB, 2.5TB, 6TB, 12TB and 18TB with LTO-9. The first LTO-10 media, introduced in 2025, stored 30TB, and a longer cartridge announced afterward raised that to 40TB. Over about 25 years, cartridge capacity has grown roughly 400 times in the same physical form factor. By comparison, 3.5-inch hard drives went from around 75GB to as much as 44TB, an increase of about 585 times.
The 40TB cartridge draws on two scaling paths: denser recording and more tape. LTO-10 uses 15,104 data tracks, up 68.5% from 8,960 in LTO-9, made possible by a new barium ferrite recording layer and a redesigned servo system that keeps the head aligned with narrower tracks, even amid shock and vibration. The 40TB version also uses a thinner, smoother Aramid base film. According to MagStor, that raises tape length from about 1,035 meters to around 1,335 meters. It works in the same LTO-10 drives as the 30TB media.
There seems to be considerable headroom left. In 2020, IBM and Fujifilm demonstrated a strontium ferrite tape with an areal density of 317 Gb/in², which they said could in theory allow a 580TB cartridge.
Even so, the LTO Program has made its roadmap less aggressive. When it extended the plan through LTO-14 in 2022, capacity was expected to roughly double each generation, reaching 576TB native for LTO-14. In November 2025 the three companies revised the targets to 70TB for LTO-11, 120TB for LTO-12, 210TB for LTO-13 and 365TB for LTO-14. They say the change puts reliability, affordability, efficiency and cost per terabyte first, and that smaller maximum capacities should shorten the time needed to store and recover data.
Speed is a weak point. Native bandwidth rose from 360 MB/s in LTO-8 to 400 MB/s in LTO-9 and stayed there for LTO-10, though hardware compression can lift effective throughput to as much as 1,200 MB/s at an assumed 2.5:1 ratio. Capacity grew 3.33 times from LTO-8 to LTO-10, while native transfer speed improved by only around 11%. Writing 40TB at 400 MB/s would theoretically take about 28 hours, before overheads. No transfer targets have been published for LTO-11 and later.
LTO-10 also breaks with tradition on compatibility. Earlier drives could generally read media from prior generations, but because the head was redesigned, an LTO-10 drive reads and writes only LTO-10 cartridges. Operators holding decades-long archives must either migrate LTO-8 or LTO-9 data or keep older drives running, which may get harder over time.
Demand, meanwhile, is rising. LTO capacity shipments reached 160.3 exabytes in 2025, down 9% from the prior year, but first-quarter 2026 shipments jumped 57% year over year, according to the consortium. It credited AI-related data growth, traditional archiving, cyber-resilient backups, continued LTO-9 adoption and the start of the LTO-10 transition.
"AI has turned archives into strategic assets," said Stephen Bacon of HPE, who pointed to the benefit of true offline air-gapping. Quantum CEO Hugues Meyrath said tape is increasingly seen as a strategic part of modern data infrastructure, offering "predictable economics and resilient long-term data retention at scale."
Tape's strengths include low cost per terabyte, almost no power draw while offline, hardware encryption, a physical air gap once a cartridge is removed, and the LTFS file system for easier file management. Its core drawback remains sequential access, which rules out the random-access performance of HDDs or SSDs. With a roadmap stretching to 365TB and lab results suggesting more room to grow, the format shows little sign of fading.
