Possible causes of a defective card:
Mobile phone
The loudspeaker magnets used in all mobile phones create a static magnetic field, which can
demagnetise the card’s magnetic stripe. More precisely, it can erase the encoding, rendering the
card unusable.
Magnetic pocketbook clasps
Watch out ladies! Magnetic pocketbook clasps can also erase the data contained in magnetic stripes,
though this usually only happens if the card comes in direct or very close contact to the
pocketbook’s magnetic clasp.
Mobile phone belt pouch
Belt pouches for mobile phones, Blackberries or cameras are becoming increasingly popular. Most of
them feature a magnetic clasp and some are even equipped with pockets to hold cards. This is a
dangerous combination: The clasp’s magnetic field can permanently damage the card’s magnetic
stripe.
Merchandise theft protection systems
Theft protection systems for merchandise commonly used to “disarm” articles at the cashier in many
shops can damage a card’s magnetic stripe; especially if the card is placed on the counter right next
to the disarming system. Many stores are beginning to call attention to this risk by posting warning
stickers and information in the cash-till area.
Loudspeakers, televisions
Depending on a loudspeaker or television’s magnetic shielding, a card’s existing data can be erased
when placed on top of one of these devices.
Magnetic keys
If a magnetic key comes into contact with a card’s magnetic stripe, the key’s magnetic field may
erase the card’s data. It is always best to keep cards and keys apart.
Paperclip holders
They may be very practical, but they are hazardous to cards: Paperclip holders often use a magnet to
prevent the paperclips from spilling out. While the emitted magnetic field is not very strong, it is
enough to damage a card’s magnetic stripe if the card is placed too close to the paperclip holder.
X-rays, magnetic resonance tomography (MRT)
X-rays and, in particular, magnetic resonance tomography also pose a threat of erasing data content
from magnetic stripes. This is especially true at the dentist: Dental x-rays are usually taken while the
patient is fully clothed, rendering magnetic stripe cards illegible and, thus, unusable. Always put
magnetic stripe cards in a safe location prior to a dental examination.
Magnetic ski racks
They may only be used in the winter, but magnetic ski racks can destroy magnetic stripes: The
powerful magnets they use can erase card data immediately, so extreme caution is advised. By the
way, data contained in ski passes can also be erased this way.
Here are a few other tips on how to keep magnetic stripe cards functioning for as long as possible:
Cards tend to warp when exposed to temperatures above 60° Celsius, which can be easily exceeded
inside parked vehicles on a hot summer day. Therefore, cards should not be left in the car.
Cards should not be carried together with loose change, because coins can damage cards.
Avoid carrying cards in a back pocket where they can be easily bent.
Always try to keep cards in a protective case.
AccuTime House
55 Greenfields Drive, Little Neston, South Wirral, Cheshire, England, CH64
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www.accutime.co.uk Tel.: +44 (0)151 353 0065 Fax: +44 (0)151 336 1964