💾 Somewhere in the back of a Google or Microsoft data center, there are racks of cartridges that work on the same principle as a cassette tape. A share of everything generative AI produces, the part nobody plans to read again soon, is parked on technology that has been around for more than half a century. And the company said to lead the world in making that tape is a photo film company.

Tape lives where speed doesn't matter

Storage inside a data center is not one thing. Data that has to come back instantly sits on SSDs. Data that gets read and written every day sits on hard drives. Data that almost nobody touches but nobody is allowed to delete goes onto magnetic tape. That bottom layer has a name in the industry: cold storage, the archive tier for information you keep rather than use.

So tape is not an old technology hanging on out of inertia. It has a different job.

The shipment numbers are not a straight line up. According to the LTO Program, the industry body behind the Linear Tape-Open format, 176.5 exabytes of compressed tape capacity shipped in 2024 (one exabyte is a billion gigabytes), an all-time record and a fourth straight year of growth. Then 2025 came in at 160.3 exabytes, down 9%. Still the second-biggest year on record, but the winning streak ended.

The turn is very recent. In figures published on September 1, 2026, the group said shipped capacity in the first quarter of 2026 was 57% higher than a year earlier, crediting storage buildout for AI workloads and a new high-capacity cartridge that arrived in early 2026. Tape did not start climbing last year. It started climbing this year.

Not using electricity became the selling point

The International Energy Agency's 2026 report Key Questions on Energy and AI puts global data center electricity consumption at 485 terawatt-hours in 2025, up 17% in that year alone, and projects it will roughly double to around 950 terawatt-hours by 2030. In its previous report the agency estimated that for Japan, data centers would account for more than half of all growth in national electricity demand through 2030.

A tape sitting on a shelf draws almost no power. Nothing spins, nothing needs cooling. Fujifilm says on its Japanese site that shifting bulk archival data to tape cuts CO2 emissions by 95% compared with keeping it on hard drives. Its North American site puts the figure at 97% less over a decade. Both are the company's own figures, not independently audited.

Either way, the case for leaving rarely-read data on spinning disks is harder to make than it was five years ago.

Nothing to hack when nothing is plugged in

The second reason is blunter. A cartridge on a shelf is not connected to anything.

The LTO Program points to offline, air-gapped backups as a defense against ransomware, on the reasoning that removable media kept off the network shrinks the surface an attacker can reach. Combined with WORM, a write-once mode that blocks later modification, tape now shows up in ransomware planning documents more often than in nostalgia pieces.

The more aggressive the attacks get, the more valuable it becomes that this medium never learned to talk to a network. What revived tape was not progress in the technology but deterioration around it.

The 40-terabyte cassette

On December 22, 2025, Fujifilm announced the LTO Ultrium 10 (40TB) Data Cartridge, which went on sale in January 2026. It holds 40TB uncompressed and up to 100TB compressed on a single reel, about 1.3 times the company's 30TB LTO-10 cartridge. Fujifilm says it got there by thinning the tape itself and running roughly 30% more of it into the same shell. The standard now has two capacity points at generation 10: 30TB and 40TB native.

The LTO Program's published roadmap targets 913TB per cartridge at generation 14. Whatever people picture when they hear the word tape, small is no longer part of it.

The pillar nobody put in the story

Fujifilm's reinvention is a story most people in Japan can recite. The photographic film market peaked in 2000, halved by 2006, and fell to less than a tenth of its peak by 2010. The company survived by pushing into medical devices, cosmetics and semiconductor materials.

Magnetic tape barely appears in that telling. Yet Fujifilm began researching magnetic recording materials in 1954, succeeded in recording and playing back a prototype videotape at NHK's research labs in 1959, and put a computer tape, the Fujifilm Memory Tape, on sale in 1965. All through the years the film business was collapsing, this one kept going quietly in the background.

According to a September 8, 2026 article in Toyo Keizai Online, Fujifilm now leads the world in magnetic tape media, and Google, Microsoft and Baidu use it in their data centers. The piece called it a hidden, highly profitable product.

The scale is small, though. By that article's account, the electronics segment that contains the tape business posted 456.2 billion yen in revenue in fiscal 2025, about $2.96 billion at the September 8, 2026 rate of 154 yen to the dollar, while the tape business itself runs in the hundreds of millions of dollars. As of September 2026, the company expects it to roughly double year on year in fiscal 2026. It is not what holds the company up. It is a small pillar that suddenly started growing.

The newest data sleeps on the oldest method

Some fraction of what generative AI produced this year is sitting on the descendant of a recording format that went on sale in Japan in 1965. Newer is not automatically better. Change what a technology is asked to do, and the scoreboard changes with it.

None of which guarantees tape keeps winning. If the cost per terabyte of hard drives keeps falling, or if another long-term archival medium reaches production, the balance moves again. For now, drawing no power and speaking to no network happen to be exactly what the moment rewards.

Where does your country leave the data it is not using?

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