Re: [SI-LIST] : susceptibility hard disks

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From: Charles R. Patton (charles.r.patton@ieee.org)
Date: Wed May 17 2000 - 09:32:42 PDT


Jan Vercammen wrote:

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

On low frequency magnetic fields the spec tends to be controlled by the sensitivity of
the read head since most hard drive assemblies are cast aluminum and provide no magnetic
shielding. The ambient fields distort the readback waveform, and with the problems they
already have with non-linearity in the MR/GMR heads, this doesn’t help. So talk to your
head group, and ask what fields they can stand.

Charles R. Patton, Owner
Synergy Co.
“Creative, Cost Effective EMI, ESD and Analog Design Solutions”
21490 Camino Arriba
Murrieta, CA 92562
Phone: 909-698-9657
Fax: 909-698-0224
Email: charles.r.patton@ieee.org

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