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Low Flying Interface Lubricant Design

IP.com Disclosure Number: IPCOM000016296D
Original Publication Date: 2002-Sep-29
Included in the Prior Art Database: 2003-Jun-21
Document File: 1 page(s) / 100K

Publishing Venue

IBM

Abstract

Presented is a lubrication system to allow low flying interfaces that are required for future HDDs. In the attached graph, you can see the flying height difference at which the head starts to interact with the disk, as a function of lube molecular weight. With lower molecular weight we can fly lower.

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Low Flying Interface Lubricant Design

Presented is a lubrication system to allow low flying interfaces that are required for future HDDs. In the attached graph, you can see the flying height difference at which the head starts to interact with the disk, as a function of lube molecular weight. With lower molecular weight we can fly lower.

Similar effects can be seen with the thickness of the lubrication. By controlling the lube level we can define the best interface for low flying heights. With thinner lube we can fly lower. Typically we try to define thick lube to give the longest durability.

0.05

0.45

0.4

0.35

0.3

0.25

0.2

0.15

22A Z-dol

15A Z-dol

9.5A Z-dol

6.1A Z-dol

AE (rms)(V)

0.1

0 10 20 30 40 50 60 70 80

- Pressure (KPa)

Thin film disk / Negative Pressure slider

Lubrication at higher levels has been shipped in files in the past to maximize durability. We define a thickness level that is lower than conventional thinking would suggest to get improved flyability.

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