11 Mar
2013
11 Mar
'13
6:27 p.m.
On 03/11/2013 05:55 PM, Dave McGuire wrote:
I believe the plastic wrap trick is to give the
rubber roller in the
reader a better grip on the card, if the card is too slippery to make it
turn.
Most of what I've read seems to say that it lowers the signal level a
bit and reduces some extraneous noise in the signal:
http://www.creditcards.com/credit-card-news/lick-plastic-bag-credit-card-se…
But the bit density on a credit card is very low in comparison to a
floppy disk. I imagine that increasing the head-media separation to the
thickness of a bit of cling wrap would most likely make the disk harder
to read.
--Chuck