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- Newsgroups: sci.electronics
- Path: sparky!uunet!das.wang.com!wang!dbushong
- From: dbushong@wang.com (Dave Bushong)
- Subject: Re: Anti-shoplifting devices and magnetic media
- Organization: Wang Labs, Lowell MA, USA
- Date: Wed, 18 Nov 1992 04:01:32 GMT
- Message-ID: <Bxw8IL.G95@wang.com>
- References: <1992Nov14.122228.17435@husc3.harvard.edu>
- Lines: 31
-
- bdenckla@husc10.harvard.edu (Benjamin Denckla) writes:
-
- >This morning I walked in and out of a number of shops with
- >anti-shoplifting detectors similar to the security devices they have in
- >libraries, i.e. two vertical inverted U-shaped bars on either side of the
- >exit. Then I found that the disk I had been carrying had some errors on
- >it which were not there beforehand. I assume that this is some kind of a
- >detector for non-demagnetized, i.e. not bought merchandise. I have heard
- >that the demagnetizing pads on the check out-counter will erase credit
- >cards so I try to stay away from them. But can anyone tell me if my disk
- >could have been damaged by the detectors? Also, how far away should I
- >keep magnetic media like disks, credit cards, and DAT's from the
- >demagnetizing check out counter pad? is a foot enough? If anyone could
- >help I would really appreciate this as this is a very scary situation,
- >especially without information as to exactly how scared I should be.
-
- >Ben Denckla
-
- Take your tour again, but this time with a pocket compass. If it
- doesn't violently react to the devices, the diskette is probably
- safe. By the way, the reaction I was talking about is one which,
- if the compass could talk, it would say boinnnnggggggg! Normally
- the disk would have to be close to the magnet to affect it; or the
- magnet would have to be strong enough where you would feel the pull
- on your car keys in your pocket.
-
- Dave
- --
- Dave Bushong, Wang Laboratories, Inc. Amateur Radio Callsign KZ1O
- Project Leader, OCR products kz1o@n0ary.#noca.ca.na
- Internet: dbushong@wang.com
-