ISO 7298:1985 PDF

Information processing — Magnetic disk for data storage devices — 158 000 flux transitions per track, 210 mm (8.3 in) outer diameter, 100 mm (3.9 in) inner diameter

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Title (English):

ISO 7298:1985

Information processing — Magnetic disk for data storage devices — 158 000 flux transitions per track, 210 mm (8.3 in) outer diameter, 100 mm (3.9 in) inner diameter

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 15
Publication date:: May 9, 1985
Edition:: ISO IS 7298 edition 1 version 1
ICS:: 35.220.21

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Description (English):

Lays down the mechanical, physical and magnetic characteristics for a lubricated magnetic disk of 210 mm (8.3 in) outer diameter and 100 mm (3.9) inner diameter intended for data storage devices. Defines requirements for a disk to enable satisfactory performance at 158 368 flux transitions per track. Other densities may necessitate modified characteristics.

Technical details

Technical committee: ISO/IEC JTC 1 - Information technology
SKU: ISO 7298:1985

Abstract

Overview

ISO 7298:1985 - Information processing: Magnetic disk for data storage devices defines the mechanical, physical and magnetic characteristics for a lubricated magnetic disk of 210 mm outer diameter and 100 mm inner diameter intended to operate reliably at 158 368 flux transitions per track (often referenced as 158 000). Published in 1985, the standard sets environmental, dimensional, surface-finish and magnetic-testing requirements to ensure satisfactory performance at the specified track density. It also notes that other areal densities may require modified characteristics.

Key topics and requirements

Scope & environment
- Operating air temperature: 15 °C to 57 °C; relative humidity 8–80% (wet-bulb limits specified).
- Air cleanliness: Class 100 (Annex A).
- Ambient stray magnetic field limits to avoid data corruption.
Dimensions & geometry
- Inner diameter: 100.00 ±0.05 mm; outer diameter: 210.00 ±0.10 mm.
- Concentricity, circularity and chamfering requirements to control unbalance and runout.
- Clamping area and non‑magnetic zones defined for head flight and clamping.
Physical characteristics
- Thickness: ~1.905 ±0.025 mm.
- Moment of inertia and rotational-stress capability (disk capable of withstanding up to 6 000 r/min).
- Runout and axial limits (e.g., axial runout and velocity/acceleration test conditions).
Surface and friction
- Magnetic surface roughness: arithmetic average

Related standards

Other ISO standards

Overview

Key topics and requirements

Scope & environment
- Operating air temperature: 15 °C to 57 °C; relative humidity 8–80% (wet-bulb limits specified).
- Air cleanliness: Class 100 (Annex A).
- Ambient stray magnetic field limits to avoid data corruption.
Dimensions & geometry
- Inner diameter: 100.00 ±0.05 mm; outer diameter: 210.00 ±0.10 mm.
- Concentricity, circularity and chamfering requirements to control unbalance and runout.
- Clamping area and non‑magnetic zones defined for head flight and clamping.
Physical characteristics
- Thickness: ~1.905 ±0.025 mm.
- Moment of inertia and rotational-stress capability (disk capable of withstanding up to 6 000 r/min).
- Runout and axial limits (e.g., axial runout and velocity/acceleration test conditions).
Surface and friction
- Magnetic surface roughness: arithmetic average

ISO 7298:1985 PDF

Technical details

Abstract

Overview

Key topics and requirements

Related standards

Abstract

Overview

Key topics and requirements

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