Browse Prior Art Database

Measurement method of ambient temperature by Load/Unload

IP.com Disclosure Number: IPCOM000014842D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Abstract

Disclosed is a Method of Measurement ambient temperature by Load/Unload calibration.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 87% of the total text.

Page 1 of 2

Measurement method of ambient temperature by Load/Unload

   Disclosed is a Method of Measurement ambient temperature by Load/Unload
calibration.

   The influence of a surrounding temperature in HDD is growing, because of HDD
become high density and high performance.

   This invention is the one to give the function that a surrounding temperature
can be measured by LOAD/UNLOAD calibration function.

 2.5-inch HDD product used Load/Unload Function. So, Need to measure of the
relation between Digital Analog Converter values and
reverse current value before Load/Unload Function. This result has some gap
according to surround temperature. (Please show Fig.1)

Fig.1
It can be understood that the inclination changes depending on the ambient
temperature, therefore guess the ambient temperature
by seeing this amount of the change.

For example. Following data is measured by Yukon. (Please show Fig.2)

1

[This page contains 1 picture or other non-text object]

Page 2 of 2

Fig.2

X-axis is the surrounding temperature value, and Y-axis is the values of the
inclination.

The value of the inclination will understand according to the change the
temperature.

At first, the inclination of the temperature that is basic is measured.
So, The temperature at that time is understood by comparing that basic value
with the value of each boot-up.

Example of above case:
Inclination value/temperature: 0.43
Basic temperature: 25
Inclination value: -5
Boot-up inclination value: 7

Boot-up Temperature = (7 - (-5)) / 0.43 + 25

=5...