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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Random access storage lets a computer retrieve or change data at a selected location without first reading everything that comes before it. “Random” describes the access method—not unpredictable data, a user choosing locations arbitrarily, or a guarantee that every request takes the same amount of time.
What does random access mean?
With random access, a system can go directly to the requested data location instead of searching records serially from the beginning. The U.S. Department of Justice glossary calls this “direct access” and defines it as access whose time does not depend on the location most recently accessed. It describes the device as going directly to the data. U.S. Department of Justice, Glossary of Computer Security Terminology (PDF, p. 105).
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That definition concerns how data is reached. It does not, by itself, say whether the storage is temporary or persistent, or specify a device’s performance.
How random access differs from sequential access
| Access method | How data is reached | Example |
|---|---|---|
| Random (direct) access | The system targets a selected location without reading all earlier data first. | A hard-disk subsystem is an example in the DOJ glossary. |
| Sequential access | Records are searched serially, from beginning to end, and processed in their entered order. | Tape-style retrieval illustrates the need to move through a sequence to reach later data. |
The distinction is about access order, not a blanket speed ranking. The glossary’s definition is not a benchmark and does not establish a particular response time for any device.
#1 Best Overall
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- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Is random access the same as RAM?
No. Random access describes a way of accessing data; RAM is a type of temporary memory. RAM can be read and changed while a computer is in use, and its contents are lost if the system loses power. NIST’s OSAC Lexicon gives that definition, citing ANSI/ASTM E1732 (2025). NIST OSAC Lexicon.
Persistent storage, by contrast, retains saved data when power is off. IBM distinguishes this storage from RAM’s working memory and discusses persistent storage arrangements such as file, block, and object storage. Those terms describe storage organization and addressing, rather than making “random access” another name for RAM. IBM: What is data storage?
Rank #2
- Easily store and access 5TB of content on the go with the Seagate portable drive, a USB external hard Drive
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Why is RAM called random access?
RAM’s name reflects its ability to access locations directly rather than requiring data to be read in sequence. The word “random” does not mean the computer picks a location unpredictably. Nor does the label promise identical real-world latency for every request: the DOJ definition describes independence from the most recently accessed location, not equal timing under all conditions.
Can random-access data take different amounts of time to retrieve?
Yes. “Random access” identifies the access method, not a fixed response time. The DOJ glossary’s wording expresses a defining distinction from sequential access; it is not a performance guarantee or measurement. The evidence cited here does not establish a numeric latency or speed for a particular device.
Quick Recap
Best Value
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- Easily store and access 4TB of content on the go with the Seagate Portable Drive, a USB external hard drive.Specific uses: Personal
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
Rank #3
- Easily store and access 1TB to content on the go with the Seagate Portable Drive, a USB external hard drive.Specific uses: Personal
- Designed to work with Windows or Mac computers, this external hard drive makes backup a snap just drag and drop. Reformatting may be required for Mac
- To get set up, connect the portable hard drive to a computer for automatic recognition no software required
- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
- The available storage capacity may vary.
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