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The cloud's coldest data lives on tape
💡 Tape survives not because it's fast, but because it's the cheapest, most durable, and most ransomware-resistant way to keep data you almost never need to read.
It sounds like a museum piece, but magnetic tape is one of the most actively developed storage technologies on Earth. Hyperscalers and banks store their archival ("cold") data — backups, scientific datasets, legal records — on cartridges of tape sitting in robotic libraries. The dominant format, LTO (Linear Tape-Open), packs an astonishing amount into one palm-sized cartridge: an LTO-9 tape holds about 18 terabytes of raw data on a single ribbon roughly a kilometer long, wound past the read/write head at high speed.
Why tape when SSDs are fast and cheap-ish? Because for data you rarely touch, tape wins on the metrics that matter: cost per terabyte, energy use, and longevity. A cartridge on a shelf draws zero power, is rated to survive ~30 years, and — crucially — is physically offline when not mounted. That "air gap" makes it immune to ransomware that can reach any live disk on the network.
The tradeoff is latency. There's no random access: a robot arm must fetch the cartridge, load it into a drive, and spool to the right spot, so retrieving a file can take minutes, not milliseconds. That's exactly why cloud "deep archive" tiers are cheap but warn you of long restore times — behind the friendly API, a machine is often literally reaching for a tape.