Re: [SI-LIST] : susceptibility hard disks

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From: ajmani@us.ibm.com
Date: Tue May 16 2000 - 12:24:05 PDT


There are no industry specs for magnetic susceptibility for hard drives.
IBM Server Class hard drives are tested to the following limits:

          DC to 400 Hz 5.0 Gauss
          400 Hz to 5 kHz 2.0 Gauss
          5 kHz to 50 kHz 0.5 Gauss
          50 kHz to 200 kHz 0.1 Gauss

Regards, Ravinder
PCB Development and Design Department
IBM Corporation - Storage Systems Division
Email: ajmani@us.ibm.com
***************************************************************************
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jvercamm@roam.agfa.be (Jan Vercammen)@silab.eng.sun.com on 05/16/2000
06:00:31 AM

Please respond to si-list@silab.eng.sun.com

Sent by: owner-si-list@silab.eng.sun.com

To: si-list@silab.eng.sun.com
cc:
Subject: [SI-LIST] : susceptibility hard disks

hello,

I hope someone can help me with the following question:

What is the susceptibility of (current) hard disks with respect to DC and
low frequency (< 100kHz) magnetic fields.

I have found specs in old manuals (Conner disks, at least 10 yr old) which
list
6 Gauss max. (DC to 700kHz). On the Seagate web site I have found a single
spec of
max. 5 Gauss for a small hard disk (4.2Gbyte).

Probably others have encountered similar questions and I was hoping that
the si-list
could help me on this problem or at least direct me to some useful sites.

regards,

Jan Vercammen
Agfa-Gevaert, EMC/PCB Engineering

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