# 3.5-inch drive

> computer drive form factor

**Wikidata**: [Q65037416](https://www.wikidata.org/wiki/Q65037416)  
**Source**: https://4ort.xyz/entity/3-5-inch-drive

## Summary
A **3.5-inch drive** is a computer drive form factor with a diameter of 3.5 inches, commonly used for both hard disk drives (HDDs) and floppy disk drives. It is a standard size in personal computing, known for its balance between capacity and physical size.

## Key Facts
- **Form factor**: 3.5-inch diameter, widely adopted in personal computers.
- **Common uses**: Hard disk drives (HDDs) and floppy disk drives.
- **Standards**: Defined by the **Small Form Factor Committee** and the **Electronic Industries Alliance**.
- **Aliases**: Includes terms like "3½-inch drive," "3.5" hard drive," and "LFF drive."
- **Subclass of**: **Drive** and **disk drive**, as it records data on rotating disks.
- **Commons categories**: Includes images of 3.5" hard drives and floppy disk drives.
- **Wikidata description**: A computer drive form factor.

## FAQs
### Q: What is the difference between a 3.5-inch hard drive and a 2.5-inch hard drive?
A: A 3.5-inch hard drive is larger and typically offers more storage capacity than a 2.5-inch drive, which is more common in laptops and slim desktop systems.

### Q: Are 3.5-inch drives still used today?
A: While less common in modern laptops, 3.5-inch HDDs are still used in desktop computers and some high-capacity storage solutions due to their higher storage densities.

### Q: What types of drives use the 3.5-inch form factor?
A: The 3.5-inch form factor is used for both **hard disk drives (HDDs)** and **floppy disk drives**, though floppy drives are now obsolete.

### Q: Who standardized the 3.5-inch drive?
A: The **Small Form Factor Committee** and the **Electronic Industries Alliance** defined the 3.5-inch drive as a standard form factor for computer storage.

### Q: Can a 3.5-inch drive be used in a laptop?
A: No, 3.5-inch drives are too large for laptops and are primarily used in desktop computers and external storage enclosures.

## Why It Matters
The 3.5-inch drive form factor was a significant development in personal computing, offering a balance between storage capacity and physical size. It became the standard for desktop computers, allowing for larger hard drives that could store more data. While it has been largely replaced by smaller form factors in modern laptops, 3.5-inch drives remain relevant in desktops and high-capacity storage solutions. The standardization of this form factor by the Small Form Factor Committee and the Electronic Industries Alliance ensured compatibility across different manufacturers, making it a cornerstone of early and mid-20th-century computing.

## Notable For
- **Standardization**: One of the first widely adopted form factors for hard disk drives.
- **Capacity**: Early 3.5-inch HDDs could store hundreds of megabytes, a significant advancement over floppy disks.
- **Legacy Use**: Still used in desktops and external storage enclosures for high-capacity needs.
- **Floppy Disk Evolution**: The 3.5-inch form factor was also used for floppy disks before their decline.
- **Industry Impact**: Helped define the physical and functional standards for computer storage.

## Body
### Origins and Standardization
The 3.5-inch drive form factor was standardized by the **Small Form Factor Committee** and the **Electronic Industries Alliance**, ensuring compatibility across different manufacturers. This standardization was crucial for the widespread adoption of hard disk drives in desktop computers.

### Common Applications
- **Hard Disk Drives (HDDs)**: The primary use of 3.5-inch drives, offering high storage capacities.
- **Floppy Disk Drives**: Used in early computers for removable storage before being replaced by optical drives.

### Physical Characteristics
- **Diameter**: 3.5 inches, making it larger than 2.5-inch drives but smaller than older 5.25-inch drives.
- **Mounting**: Typically installed in desktop computer cases or external enclosures.

### Legacy and Modern Use
- **Desktop Computers**: Still used in desktops for high-capacity storage.
- **External Storage**: Often found in external hard drive enclosures.
- **Obsolescence**: Rare in modern laptops due to size constraints, replaced by smaller form factors.

### Technical Specifications
- **Storage Capacity**: Early models could store hundreds of megabytes, later models reached terabytes.
- **Interface Standards**: Used IDE, SATA, and other storage interfaces over the years.

The 3.5-inch drive remains an important part of computing history, bridging the gap between early storage solutions and modern high-capacity drives.