# RA90

> disk drive

**Wikidata**: [Q7274956](https://www.wikidata.org/wiki/Q7274956)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/RA90)  
**Source**: https://4ort.xyz/entity/ra90

## Summary
The RA90 is a disk drive manufactured by Digital Equipment Corporation (DEC). Its technical documentation is publicly available online through a specific PDF archive.

## Key Facts
- **Manufacturer:** Digital Equipment Corporation (DEC)
- **Instance Of:** Disk Storage
- **Freebase ID:** /m/02zz8d
- **Sitelink Count:** 1 (primarily referring to its Wikipedia page)
- **Wikipedia Title:** RA90
- **Described At URL:** [ftp://bitsavers.informatik.uni-stuttgart.de/pdf/dec/disc/ra90/EK-ORA90-SV-003_RA90_RA92_Service_Jun90.pdf](ftp://bitsavers.informatik.uni-stuttgart.de/pdf/dec/disc/ra90/EK-ORA90-SV-003_RA90_RA92_Service_Jun90.pdf) (English language document, last modified 2016-12-29, PDF format)
- **Wikipedia Languages:** English

## FAQs
### Q: What is the RA90?
A: The RA90 is a disk drive product developed by Digital Equipment Corporation (DEC). It belongs to the class of disk storage mechanisms.

### Q: Who manufactured the RA90 disk drive?
A: The RA90 disk drive was manufactured by Digital Equipment Corporation (DEC).

### Q: Where can I find official documentation for the RA90?
A: Official service documentation for the RA90 is available as a PDF file through the Bitsavers archive, specifically at the provided FTP link.

### Q: What type of storage device is the RA90?
A: The RA90 is classified as a disk drive, a type of disk storage mechanism.

### Q: Is information about the RA90 available in multiple languages?
A: The primary accessible information, including its Wikipedia page and documentation, is in English.

## Why It Matters
The RA90 represents a specific hardware product within the broader category of disk storage systems historically used by Digital Equipment Corporation. Its documentation being preserved and publicly accessible makes it a resource for understanding DEC's storage technology and legacy systems. While seemingly a niche product, its preservation contributes to the historical record of computing hardware, particularly enterprise storage solutions from the era. The availability of its service manual online aids researchers, historians, and engineers studying DEC's hardware architecture and maintenance practices. It underscores the importance of preserving technical documentation for historical computing equipment.

## Notable For
*   Being a specific disk drive model manufactured by the prominent company DEC (Digital Equipment Corporation).
*   The preservation and public availability of its detailed service manual online via the Bitsavers archive.
*   Its classification under the specific "disk storage" entity type within knowledge bases.
*   Having its primary descriptive information available in English language only.

## Body
### Manufacturer and Classification
*   The RA90 was produced by **Digital Equipment Corporation (DEC)**.
*   It is an **instance of** the class "**disk storage**".

### Documentation and Accessibility
*   Detailed service documentation for the RA90 is available as a PDF file.
*   The specific URL for the document is: `ftp://bitsavers.informatik.uni-stuttgart.de/pdf/dec/disc/ra90/EK-ORA90-SV-003_RA90_RA92_Service_Jun90.pdf`
*   This document is in the **English language**.
*   The document's last recorded modification date within the archive is **December 29, 2016**.
*   The document format is **PDF**.

### Knowledge Base Representation
*   The RA90 is recorded with the **Freebase ID**: `/m/02zz8d`.
*   It has a **Wikipedia page** titled simply "**RA90**".
*   The RA90 entity has a **sitelink count of 1**, indicating primarily a single significant linked reference (the Wikipedia page).
*   Its associated knowledge base descriptions (e.g., Wikidata) classify it as a "**disk drive**".