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Magnetic tape is the practical choice for cold data archives today: it is an established, low-cost medium with current capacity and performance specifications. DNA storage offers extraordinary theoretical density and the possibility of very long retention, but synthesis, sequencing, cost, access speed, and system maturity keep it from being a broadly deployable alternative.
How DNA storage and tape work
DNA storage encodes digital information into sequences of synthesized DNA. To retrieve the information, the DNA must be sequenced and the resulting data decoded. Magnetic tape stores data magnetically on a moving strip; a compatible tape drive reads or writes it. The difference matters: DNA’s headline density describes a potential property of the storage molecule, while tape specifications describe cartridges used in real storage systems.
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Capacity: DNA’s density is theoretical; tape has specified cartridge capacities
Microsoft Research estimates that DNA could hold up to about 1 exabyte per cubic millimeter. The U.S. Government Accountability Office (GAO) reports potential capacity of more than 11 trillion gigabytes per cubic inch. These figures describe theoretical density, not the usable capacity of a commercially available DNA archive. Microsoft Research describes its project as investigating molecular-level archival storage, not offering a rated product (Microsoft Research: DNA Storage; GAO, 19 May 2022).
For a concrete current tape comparison, the LTO Program lists two LTO-10 native cartridge capacities. Its larger compressed figures assume a 2.5:1 compression ratio, which does not apply uniformly to all data:
#1 Best Overall
- High Storage Capacity of 18TB and up to 45 TB compressed capacity
- Supports transfer speeds of 400 MB/s (native), 1,000 MB/s (2.5:1) with Generation
- Barium Ferrite (BaFe) technology
- Support for tape drive hardware encryption
- Compatible with Linear Tape File System (LTFS)
| LTO-10 cartridge option | Native capacity | Compressed capacity at stated 2.5:1 ratio |
|---|---|---|
| 30 TB | 30 TB | Up to 75 TB |
| 40 TB | 40 TB | Up to 100 TB |
These are format capacities, not a guarantee that a particular workload will compress to the stated ratio. The LTO Program publishes the figures on its LTO Tape Technology page.
Durability: molecular longevity is not an archive guarantee
DNA
DNA may remain stable for very long periods when stored under suitable conditions. Microsoft Research cites a molecular half-life estimate above 500 years, while GAO says DNA could last thousands of years at very low temperature. These are conditional estimates about DNA, not guarantees that a complete archive will remain readable for those periods.
Rank #2
- Upc: 883436693417
- Weight: 0.550 lbs
Recoverability also depends on the encoding and error correction, sample handling, storage conditions, and continued access to suitable synthesis and sequencing methods. A durable molecule alone does not ensure that the stored information can be retrieved.
Magnetic tape
Tape is a mature medium used for infrequently accessed archives, but the sources cited here do not establish a single lifespan figure that can be compared fairly with DNA’s molecular estimates. An archive’s useful life depends on managing the tape, compatible drives and libraries, and the formats and systems needed to read it. IBM’s review describes tape technology, libraries, retrieval, and its role in archival storage (IBM Research, 8 January 2025).
Rank #3
- Made in China
- Package height :11.4 cm
- Package length :2.8 cm
- Package width :10.8 cm
Speed: tape has a published rate; DNA has no comparable figure here
The LTO Program specifies a 400 MB/s data rate for LTO-10. Tape is sequential media, so actual performance also depends on the drive, data layout, and system configuration; the specification is not a promise that every archive will deliver that rate in every workload (LTO Tape Technology).
DNA writes require synthesis and reads require sequencing. The cited sources identify speed as a barrier to deployment but do not provide a comparable current end-to-end throughput figure for a DNA storage system. A direct numerical speed contest would therefore imply a level of comparability the available specifications do not establish. SNIA’s overview of the DNA Data Storage Alliance’s 2025 work identifies speed, equipment size and complexity, capacity, and cost among continuing challenges (SNIA: DNA Data Storage Alliance).
Rank #4
- Recording technology: lto-8 Ultrium 30750
- Capacity: 30 TB
- Host interface 6 GB/s SAS
Cost: tape is practical today; DNA figures are historical
IBM Research describes tape as a low-cost, low-energy option for infrequently accessed data. Actual tape system costs depend on drives, libraries, workload, and operations; a cartridge price alone would not represent the cost of an archive.
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GAO reported DNA storage at about $3,500 per megabyte in May 2022 and said it then cost millions of times more than hard-drive storage. That is historical context, not a 2026 quote or a like-for-like comparison with tape. The available figures do not support a current DNA-versus-tape cost per terabyte. A fair lifecycle comparison would need equivalent assumptions for DNA synthesis and sequencing, storage conditions and error correction, tape drives and libraries, workload, retention period, and refresh or migration policy (GAO, 19 May 2022).
Best Value
- Storage capacity: 25,000GB (2.5TB) native to 625,000GB (6.25TB) compressed
- Transfer rate (native): 160 Mbs
- 2775.59-Feet Storage
Readiness: where each medium fits
Choose tape for established cold archives
Tape is the more practical option when data is accessed infrequently, low operating energy and cost matter, and the organization can support compatible tape infrastructure. LTO-10 is a current format, but an LTO cartridge requires a compatible tape drive; it is enterprise archival media, not a standalone consumer backup device. In an August 2025 announcement, the LTO Program quoted IDC Research Vice President Phil Goodwin saying, “Tape continues to deliver some of the best value in data storage, combining low costs with minimal energy use.” This is an attributed analyst statement, not an independent comparative test (LTO Program, August 2025).
Watch DNA storage as a developing archival technology
DNA storage is compelling where extreme density and potential long-term molecular stability are research goals. But its theoretical density should not be mistaken for a deployable archive’s capacity, and its synthesis, sequencing, speed, cost, and equipment requirements remain obstacles to broad use. The DNA Data Storage Alliance has published standards work and specifications, but SNIA’s overview still describes significant commercialization barriers (SNIA: DNA Data Storage Alliance).
Quick Recap
At a glance
| Factor | DNA storage | Magnetic tape |
|---|---|---|
| Capacity | Exceptional theoretical density; no comparable commercial archive capacity established by the cited sources. | LTO-10 lists 30 TB and 40 TB native options; compressed capacity is up to 75 TB and 100 TB respectively at a stated 2.5:1 ratio. |
| Durability | Potentially very long-lived under suitable conditions; molecular estimates do not establish whole-system recoverability. | Mature archival medium; no comparable single tape lifespan figure established by the cited sources. |
| Speed | Synthesis and sequencing create access hurdles; no comparable current end-to-end rate stated by the cited sources. | LTO-10 specifies 400 MB/s; realized performance depends on drive, layout, and system. |
| Cost | GAO’s approximately $3,500/MB estimate is from May 2022, not a current price. | Described by IBM Research as low-cost and low-energy for infrequently accessed data; system costs vary. |
| Readiness | Research and proof-of-concept stage for broad archival use. | Established format and ecosystem for archival deployments. |
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