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DNA, holographic media, and glass-based systems are experimental ways to preserve digital information for very long periods or at extremely high physical density. DNA stores bits as sequences of synthetic molecules and retrieves them by sequencing. Holographic media records optical interference patterns throughout a material volume. Microsoft’s Project Silica uses femtosecond lasers to create microscopic structures inside quartz glass and reads them with polarization-sensitive microscopy.
All three have demonstrated important pieces of an end-to-end workflow, but none is a generally available replacement for hard drives, tape, or cloud storage. Their headline density and longevity figures are project estimates or prototype results, not comparable commercial benchmarks.
What makes these technologies “emerging”?
An emerging storage technology has moved beyond a purely theoretical proposal but has not yet reached routine, economical deployment. A laboratory demonstration can prove that information can be written, preserved, read, and decoded. It does not establish a practical throughput, a low cost per terabyte, unattended operation, or a product that organizations can purchase and support.
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- Density: how many bits fit in a given mass or volume.
- Write and read throughput: how quickly data can be ingested and retrieved.
- Access pattern: whether individual files can be found quickly or a larger store must be processed.
- Durability: how the medium behaves over decades under specified environmental conditions.
- Energy and equipment: the lasers, microscopes, sequencers, synthesis systems, and other infrastructure required.
- Integrity: error-correction methods and the ability to detect or repair damaged data.
- Total cost and maturity: whether a complete, maintainable system exists rather than an isolated prototype.
The published sources do not provide a controlled, apples-to-apples benchmark covering all of those measures. The figures below therefore retain their attribution and describe what has actually been demonstrated.
How DNA data storage works
Encoding bits as synthetic DNA
DNA storage converts digital information into sequences of the four DNA bases. A laboratory synthesizes short DNA molecules whose base order represents the original bits. The molecules are manufactured for storage; they are not taken from people or other living organisms.
At a high level, the workflow is:
- Prepare digital data and add coding information that helps identify fragments and recover errors.
- Translate the digital symbols into many designed DNA sequences.
- Use chemical synthesis to manufacture those sequences.
- Preserve the resulting molecules in a suitable container or material.
- Retrieve a sample and sequence the molecules with a DNA-reading instrument.
- Use software to identify the fragments, correct errors, and decode the base sequences back into files.
Microsoft Research describes synthesis, manipulation, and sequencing as the underlying biotechnology and says DNA storage is not yet practical given the current state of those processes. A review in Nature Reviews Chemistry discusses DNA as a chemical substrate for computing and data storage.
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What has been demonstrated?
Microsoft and the University of Washington reported a 2019 fully automated proof of concept that encoded the word “hello” into fabricated DNA and converted it back into digital data. The demonstration showed that the laboratory steps could be connected and automated. Microsoft explicitly said it was not intended to prove speed or low cost. Microsoft Principal Researcher Karin Strauss described the purpose this way: “The goal of the project was not to prove how fast or inexpensively the system could work, researchers say, but simply to demonstrate that automation is possible.” The account is available from Microsoft.
In a 2016 announcement, Microsoft reported that its researchers had stored 200 megabytes of data on DNA. That was a research record at the time, not the capacity of a commercial storage product; the announcement is documented at Microsoft’s AI blog.
Why the density claims are difficult to interpret
Microsoft Research’s DNA Storage overview presents an estimate of up to about 1 exabyte per cubic millimeter. This is a project-page estimate, not an independently established capacity of a deployed system. It describes the information density of DNA molecules, while a practical archive also needs synthesis equipment, sequencing equipment, containers, handling space, coding redundancy, and a way to locate the desired data.
Writing and reading are the main practical constraints. Synthesis is comparatively slow and expensive for large volumes, and sequencing adds another laboratory step before software can reconstruct a file. The sources do not provide a current cost-per-terabyte figure or a common throughput benchmark. A high theoretical density therefore does not mean that a DNA archive can ingest data as quickly as a tape library or serve files like a disk.
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Durability and retrieval trade-offs
The same Microsoft overview gives a half-life of more than 500 years as a project durability claim. Half-life is not a guarantee that every archive will last that long: actual longevity depends on the DNA formulation, packaging, temperature, humidity, contamination, and handling. Periodic integrity checks and redundant copies would still be sensible.
DNA is best understood as a potentially dense, long-lived archival medium with a specialized laboratory retrieval path. The cited demonstrations do not establish fast random access, inexpensive routine writes, or a supported consumer workflow.
How holographic data storage works
Recording information in a volume
Holographic storage uses two coordinated optical fields. A modulated signal beam carries data, while a reference beam provides a known pattern. Where the beams overlap in a recording material, their interference changes the material’s refractive index. The resulting three-dimensional pattern stores information throughout the material volume instead of only changing a surface.
During reading, the reference beam illuminates the recorded pattern. Diffraction reconstructs the data-bearing optical field, which a detector converts back into digital information. Because many pages or patterns can occupy the same volume under different optical conditions, the approach is fundamentally different from recording a single track or mark on a surface.
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Microsoft’s Project HSD (Holographic Storage for the Cloud) is described as an effort to redesign holographic storage for cloud-scale archival use. Its goals include avoiding mechanical movement and achieving high endurance. The project description is research work, not a retail drive specification; see Microsoft’s research collection and its 2020 research overview.
An ACM Transactions on Storage article, “Holographic Storage for the Cloud: advances and challenges,” examines the engineering issues involved in making the technique useful for cloud archives. The cited material does not supply a current, independently verified comparison of holographic drives with tape, hard disks, DNA, or glass on cost, latency, or sustained throughput.
Potential strengths and unresolved issues
Storing data through a material volume can provide high physical density and may allow many data pages to be addressed optically. A design without moving parts could reduce mechanical wear. In practice, the medium, optical alignment, detectors, page-management algorithms, error correction, and archival interfaces all matter. A prototype that reconstructs an optical field is not automatically a complete storage product with a standardized cartridge, predictable service life, or economical data migration.
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How Microsoft Project Silica stores data in glass
Writing microscopic structures with a femtosecond laser
Project Silica writes information inside quartz glass rather than on its surface. Ultrafast femtosecond laser pulses create microscopic structures at selected locations in the glass. Microsoft describes those structures as voxels—three-dimensional features whose position and optical characteristics encode data.
Reading uses regular light and polarization-sensitive microscopy. The microscope observes how the written structures affect polarized light, and software interprets those measurements to reconstruct the stored information. The medium is designed as write-once/read-many (WORM): data can be read repeatedly, but the same glass is not rewritten like a magnetic disk.
Capacity and longevity claims
Microsoft reports raw capacity of more than 7 TB in a square glass platter about the size of a DVD. That is a Microsoft Research project claim about a prototype medium, not an independently validated consumer-drive specification or a guaranteed usable capacity after metadata and error-correction overhead.
The Project Silica overview and a 2023 SOSP paper present the system as cloud archival research. The paper is available at Microsoft Research, and the project page is at Project Silica. Quartz is attractive for archives because it is chemically stable and does not depend on magnetic coatings, but a real longevity figure still depends on the glass composition, laser-written structures, environmental conditions, reader calibration, and error-correction design. The sources supplied here do not establish a universal service-life guarantee for every platter.
Why glass is aimed at archives
Writing with a femtosecond laser is a specialized process, while reading requires a microscope and image-processing pipeline. That makes the medium poorly suited to constantly changing files or high-frequency random updates. Its WORM behavior and the physical stability of quartz instead fit data that is written once, retained for years, and read occasionally—such as preservation copies, historical records, or a deep cloud archive.
DNA, holographic, and glass storage compared
The following table keeps unlike measurements separate. “Not stated” means the cited sources do not establish a value, not that the technology has no capability.
| Technology | Physical representation | Write and read workflow | Access and durability evidence | Published capacity evidence | Maturity |
|---|---|---|---|---|---|
| DNA | Sequences of synthetic DNA molecules | Chemical synthesis writes; sequencing and decoding read | Sequencing-based retrieval; latency and throughput not stated. Microsoft project page claims a half-life over 500 years, subject to conditions. | Up to about 1 exabyte/mm³ is a Microsoft estimate; 200 MB was reported as a 2016 research record. | Laboratory proof of concept; not a practical general-purpose archive according to Microsoft Research. |
| Holographic | Optical interference pattern stored as refractive-index variation through a recording volume | Signal and reference beams write; a reference beam diffracts the pattern to read | Potentially avoids mechanical movement in proposed cloud designs; comparable latency, endurance, and environmental figures not stated. | No common current capacity benchmark supplied by the cited sources. | Research projects and technical studies, not a cited retail product. |
| Project Silica glass | Laser-created microscopic structures inside quartz | Femtosecond laser writes; polarization-sensitive microscopy reads | Write-once/read-many; practical longevity depends on implementation and conditions. | Microsoft reports raw capacity above 7 TB in a DVD-sized square platter. | Cloud archival research prototype, not a consumer specification. |
These rows should not be read as a speed ranking. None of the cited sources reports a controlled test that uses the same data, coding overhead, equipment assumptions, and access workload for all three technologies.
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How they compare with today’s archival media
Conventional tape, hard drives, and optical media have established interfaces, procurement channels, monitoring tools, and migration practices. Emerging media may offer a better physical-density or longevity proposition, but the complete system includes readers, writers, replacement parts, software, error correction, environmental controls, and a plan for recovering data if the original laboratory equipment is retired.
For a fair evaluation, an organization should measure the same workload against every candidate:
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- usable bits after redundancy and metadata, not just raw medium capacity;
- time and energy to write a defined archive;
- time to locate and retrieve one file and to restore a large collection;
- error rates, detection methods, and repair capability after intentional damage tests;
- storage conditions and the cost of maintaining readers and writers;
- five-, ten-, and multi-decade migration plans;
- capital, media, labor, and operational costs over the archive’s full life.
The supplied sources do not establish a current cost-per-terabyte or deployment comparison on these terms, so declaring DNA, holographic storage, or glass the universal winner would overstate the evidence.
Are these technologies available to buy?
The DNA, holographic, and Project Silica systems described here are research projects or prototypes. The cited evidence does not support a consumer product recommendation, a standard retail drive, or a generally available service that an individual can purchase and operate like an external disk.
“Emerging” also does not mean “imminently available.” Commercialization would require repeatable manufacturing, standardized media and interfaces, validated retention testing, automated quality control, supportable readers, and an economic reason to migrate data from established archival systems. The demonstrations prove that particular workflows can work; they do not establish that those requirements have been met.
What a realistic archival decision looks like today
Use an emerging technology as a research option when
- the organization can fund specialized laboratory or optical equipment;
- the data is mostly write-once and can tolerate laboratory-style retrieval;
- long retention or physical density is more important than immediate access;
- there is a documented migration and media-refresh plan;
- multiple independent copies and conventional recovery paths remain available.
Do not replace an operational archive solely on a headline figure
A density estimate such as one exabyte per cubic millimeter, a 7 TB prototype platter, or a 500-year half-life does not include every component of an operational archive. Ask who measured the number, whether it is raw or usable capacity, what equipment and conditions were assumed, and whether a reader will still be serviceable when the data is needed.
Bottom line
DNA storage offers extraordinary molecular density but still depends on costly synthesis and sequencing. Holographic storage records optical information through a material volume and remains an active archival research direction. Project Silica demonstrates a different volumetric approach by writing microscopic structures inside quartz glass, with Microsoft reporting more than 7 TB on a DVD-sized platter. Each is technically significant, but the cited evidence supports prototypes and research systems—not a ready-to-buy replacement for established storage.
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