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A magnetic disk stores data on a rotating, disk-shaped surface and lets a computer access recorded locations directly. Magnetic tape stores data on a long strip that moves past a read/write head, so the drive must travel along the strip to reach a particular section. Both record information magnetically, but their physical form and access pattern make them suited to different roles.
What is a magnetic disk?
A magnetic disk is a disk-shaped medium with a magnetizable recording layer. In a drive, the disk rotates while a head reads or writes data on its surface. Because the drive can go to a particular recorded location without reading all the data before it, disk storage supports direct access.
| # | Preview | Product | Price | |
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FujiFilm 16551221 LTO8 Ultrium 12TB Storage Tape with Case | $75.99 | Buy on Amazon |
| 2 |
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IBM LTO Ultrium-5 1.5TB/3.0TB 5/pk | $104.99 | Buy on Amazon |
| 3 |
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IBM 10 Pack LTO-5 Ultrium Tape 1.5TB/ 3TB, Part # 46X1290-10PK | $208.99 | Buy on Amazon |
| 4 |
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TDK Tape, LTO, Ultrium-5, 1.5TB/3.0TB | $20.99 | Buy on Amazon |
| 5 |
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Sony LTX1500G Data Cartridge | $23.22 | Buy on Amazon |
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Hard disk drives use rigid disks. Floppy disks are a flexible version: IBM describes them as magnetic-coated Mylar disks that spin on a spindle inside a drive. IBM’s floppy-disk history explains the flexible medium and its use in a drive.
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What is magnetic tape?
Magnetic tape records information on a long, narrow, magnetizable strip. During reading or writing, the tape moves past a head. Since data is arranged along the strip, reaching a particular section requires moving the tape to that point; this is sequential access.
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- LTO8 Ultrium 12TB Storage tape: 12TB native storage capacity, 30TB compressed storage capacity
- Transfer rates: 360 MB/s native, 750 MB/s compressed
- Tape specifications: 6656 data tracks, 5.6 m tape thickness, 3149.6' / 960 m tape length
- Operating conditions: 10 to 80% storage humidity, 10 to 80% operating humidity, 16 to 35C / 60 to 95F storage temperature, 50 to 113F / 10 to 45C operating temperature
- Durability: Rewritable, LTO-8 media type
Today, data tape is commonly encountered as a cartridge used with a compatible tape drive. Tape remains in use in businesses and data centers for backup and retaining large amounts of data that are accessed infrequently. IBM’s overview covers its history and continued business use, while a 2025 technical review describes tape’s role in data storage systems.
Magnetic disk and tape: the key differences
| Feature | Magnetic disk | Magnetic tape |
|---|---|---|
| Physical form | Rotating disk surface; examples include rigid hard disks and flexible floppy disks. | Long strip of magnetizable material, commonly supplied as a cartridge for data storage. |
| How data is accessed | Direct access to a location on the disk. | Sequential access; the tape moves to the required section. |
| Common role | Storage where data needs to be accessed directly. | Backup and retention of data that is not accessed often. |
These are differences in how the media store and retrieve data, not a universal ranking. Which is faster, cheaper, or more durable depends on the media generation, drive, workload, and system.
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- Package Dimensions: 1.0" (L) x 1.0" (W) x 1.0" (H)
- Product Type: Computer Drive Or Storage
- Package Quantity: 1
- Country Of Origin: China
How disk and tape entered computer storage
Their early commercial histories are close in time. The Computer History Museum dates the UNIVAC UNISERVO—the first tape storage device for a commercial computer—to 1951. It records 1,440,000 decimal digits per reel and a read speed of 100 inches per second. The museum’s timeline marks the beginning of magnetic disk storage in 1956, when IBM shipped a RAMAC 305 system to Zellerbach Paper in San Francisco.
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IBM also identifies engineering milestones in tape’s development. In 1953, it introduced a vacuum column for the IBM 701 to help control rapid tape starts and stops. In 1964, IBM’s System/360 tape drives were described as processing 90,000 characters per second, with a stated start-and-stop time of 0.0015 second. IBM says it discontinued reel-to-reel products in 1984 as it moved toward cartridge-based products with the 3480 family.
Why magnetic tape is still used
Tape’s sequential access makes it a different fit from disk: it is useful for keeping backup copies and retaining data that does not need to be opened frequently. IBM characterizes modern tape as a high-capacity, low-energy option with low cost per terabyte for infrequently accessed data. Those are advantages described for particular systems and uses, not guarantees for every product or deployment.
IBM reported an aerial density of 317 gigabits per square inch in a 2020 research demonstration with Fujifilm. That figure describes a research result, not a specification for a consumer tape drive.
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What you need to use each medium
A hard disk drive is a familiar example of magnetic disk storage. For tape, a cartridge must match a compatible tape drive. Knowing the distinction does not require buying either: the essential difference is that disks rotate to provide direct access, while tape must move along its strip to reach data.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Sources: IBM, “Magnetic tape”; IBM, “Floppy disk storage”; Computer History Museum, “Memory & Storage | Timeline of Computer History”; IBM Research / ACM Transactions on Storage, “Magnetic Tape Storage Technology,” published January 8, 2025.
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- Format: LTO Ultrium 5
- Magnetic Material: Metal Particle
- Coercivity (kA/m): 230
- Electric Resistivity (magnetic coating: /sq): 500,000
- Electric Resistivity (backcoating: /sq): 10,000
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