Winchester disk

electronics

Written by

The Information Architects of Encyclopaedia Britannica

Last updated

July 16, 2026

Quick Summary

A Winchester disk is a type of computer disk technology that allows for high-density storage. This is achieved by sealing rigid metal disks within the disk drive mechanism to protect them from dust.1

Introduced in the 1970s, Winchester disks feature sealed platters with fixed disks. This design protects the internal components from contaminants, and the read/write head can fly very close to the platter. This proximity allows for smaller bit regions, significantly increasing storage capacity. This technology remains fundamental to modern disk drives.2

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

2 Britannica Sources

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.

computer
Secondary memory
…with fixed platters known as Winchester disks—perhaps because the first ones had two 30-megabyte platters, suggesting the Winchester 30-30 rifle. Not only was the sealed disk protected against dirt, the R/W head could also “fly” on a thin air film, very close to the platter. By putting the head closer…
Read More
…with fixed platters known as Winchester disks—perhaps because the first ones had two 30-megabyte platters, suggesting the Winchester 30-30 rifle. Not only was the sealed disk protected against dirt, the R/W head could also “fly” on a thin air film, very close to the platter. By putting the head closer…
Read More