Puppy Linux Discussion Forum Forum Index Puppy Linux Discussion Forum
Puppy HOME page : puppylinux.com
"THE" alternative forum : puppylinux.info
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

The time now is Sun 19 Nov 2017, 10:28
All times are UTC - 4
 Forum index » Taking the Puppy out for a walk » Misc
Airport scanners ?
Moderators: Flash, JohnMurga
Post new topic   Reply to topic View previous topic :: View next topic
Page 1 of 1 [15 Posts]  
Author Message
april


Joined: 14 Sep 2013
Posts: 1009
Location: Off Lizard Island for a bit

PostPosted: Wed 11 Oct 2017, 17:27    Post subject:  Airport scanners ?  

I had to fly recently .
Took my CD s with Fatdog and Puppy Precise with me in my hand luggage I think but it might have been my book in bag.

Anyhow got home and both refused to load properly . Got a new iso down and cut two new ones and they worked perfectly so I figure whatever they use now to scan luggage destroys CD s ?
Back to top
View user's profile Send private message Yahoo Messenger 
Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 12699
Location: Arizona USA

PostPosted: Wed 11 Oct 2017, 18:57    Post subject:  

How old were these CDs that you took with you? It would be interesting to take the newly burned CDs through the airport scanner to see if they stop working.
Back to top
View user's profile Send private message 
april


Joined: 14 Sep 2013
Posts: 1009
Location: Off Lizard Island for a bit

PostPosted: Fri 13 Oct 2017, 03:00    Post subject:  

Probably 12 to 18 months for the fatdog64 and a couplea three years for precise . Ill let you try a new burn . Flying is bloody stressful these days .I get hauled in every time for screws in the broken arm bone .
Back to top
View user's profile Send private message Yahoo Messenger 
bigpup


Joined: 11 Oct 2009
Posts: 9513
Location: Charleston S.C. USA

PostPosted: Fri 13 Oct 2017, 03:46    Post subject:  

Really take a close look at the condition of the CD's.

Nothing on the Internet reports airport scanners doing anything to CD's.

_________________
I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
Back to top
View user's profile Send private message 
Burn_IT


Joined: 12 Aug 2006
Posts: 2913
Location: Tamworth UK

PostPosted: Fri 13 Oct 2017, 09:48    Post subject:  

More likely to be the metal detectors. A strong magetic field could tip a rewritable over the edge of readability.
_________________
"Just think of it as leaving early to avoid the rush" - T Pratchett
Back to top
View user's profile Send private message 
april


Joined: 14 Sep 2013
Posts: 1009
Location: Off Lizard Island for a bit

PostPosted: Fri 13 Oct 2017, 17:09    Post subject:  

Well yes thats why I put it here . Its odd and has not happened before .

I cant see any physical damage to the cds and washed them over a couple of times with detergent and water . That usually gets rid of the greasy spots . all to no avail.

Just shows reads were not sucessful on certain regions
Back to top
View user's profile Send private message Yahoo Messenger 
perdido


Joined: 09 Dec 2013
Posts: 687
Location: Altair IV , Just north of Eeyore Junction.

PostPosted: Fri 13 Oct 2017, 17:52    Post subject:  

Probably nothing but a coincidence.

And if the compact discs were damaged by some invasive snooping device the govt. will deny it anyway.

.

_________________
.
Back to top
View user's profile Send private message 
cthisbear

Joined: 29 Jan 2006
Posts: 4215
Location: Sydney Australia

PostPosted: Fri 13 Oct 2017, 23:34    Post subject:  

Some people use toothpaste on buggered cds.

https://www.head-fi.org/threads/toothpaste.110569/

Chris.
Back to top
View user's profile Send private message 
bigpup


Joined: 11 Oct 2009
Posts: 9513
Location: Charleston S.C. USA

PostPosted: Sat 14 Oct 2017, 01:08    Post subject:  

Burn_IT wrote:
More likely to be the metal detectors. A strong magetic field could tip a rewritable over the edge of readability.

Please explain how?
My understanding of how a CD RW works has nothing to do with anything magnetic.
The writing material is actually melted to a different state.

Some good info here:
https://www.clir.org/pubs/reports/pub121/sec5.html

Not all discs are made with the same quality.
You get what you pay for!

_________________
I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
Back to top
View user's profile Send private message 
Burn_IT


Joined: 12 Aug 2006
Posts: 2913
Location: Tamworth UK

PostPosted: Sat 14 Oct 2017, 07:49    Post subject:  

How do you think an MRI scan works?
There are miniscule amounts of magnetic material in nearly all organic compounds and the coating on CDs is no exception.
When those articles say magetism has no effect, they are talking about general magnetic fields not those at the intensity found in MRI scans.

_________________
"Just think of it as leaving early to avoid the rush" - T Pratchett
Back to top
View user's profile Send private message 
Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 12699
Location: Arizona USA

PostPosted: Sat 14 Oct 2017, 08:29    Post subject:  

Burn_IT wrote:
How do you think an MRI scan works?
There are miniscule amounts of magnetic material in nearly all organic compounds and the coating on CDs is no exception.
When those articles say magetism has no effect, they are talking about general magnetic fields not those at the intensity found in MRI scans.

It's true that MRI requires an extremely strong magnetic field, but as far as I know, airport scanners do not use MRI or any kind of magnetic field in the vicinity of the object being scanned. People have been injured by steel objects that were attracted by the magnetic fields of MRI machines. Lots of steel objects go through airport scanners without moving at all. I'm pretty sure that airport scanners use X-rays.

I don't think the X-radiation of an airport scanner is anywhere near intense enough to much affect a CD-R. The data layer of a CD is on its backside, just beneath a thin coat of lacquer, so it is easily damaged by, for instance, writing on the back of a CD with a ball-point pen. The data layer of a DVD is sandwiched in the middle of the thickness of the DVD, protected front and back by an equal thickness of polycarbonate. This is one of the reasons why DVDs are superior to CDs.
Back to top
View user's profile Send private message 
bigpup


Joined: 11 Oct 2009
Posts: 9513
Location: Charleston S.C. USA

PostPosted: Sat 14 Oct 2017, 14:52    Post subject:  

Quote:
Metal detectors operate by generating a low-intensity magnetic field that passes from one side of the detector to the other.


If they did cause damage. Do you not think people would be all over the issue, with complaining to the airports?

_________________
I have found, in trying to help people, that the things they do not tell you, are usually the clue to solving the problem.
When I was a kid I wanted to be older.... This is not what I expected Shocked
Back to top
View user's profile Send private message 
8Geee


Joined: 12 May 2008
Posts: 1252
Location: N.E. USA

PostPosted: Sun 15 Oct 2017, 02:42    Post subject:  

I could envision an Xray scan doing this, but not really much else.

Regards
8Geee

_________________
Linux user #498913
Back to top
View user's profile Send private message 
Flash
Official Dog Handler


Joined: 04 May 2005
Posts: 12699
Location: Arizona USA

PostPosted: Sun 15 Oct 2017, 08:46    Post subject:  

I should clarify that I wasn't thinking of the metal detectors you walk through. Those probably do use some kind of magnetic field, but far too weak to affect the data layer of a CD or anything else. I was thinking of the scanners on the conveyor belt that carries your luggage past the check point. Those must use X-rays. I suppose they could have some measurable effect on flash drive data retention but not on that of a CD or DVD.
Back to top
View user's profile Send private message 
peterw

Joined: 19 Jul 2006
Posts: 273
Location: UK

PostPosted: Mon 16 Oct 2017, 04:27    Post subject: Destroying CDs at airports  

On passenger screening there is nothing that could harm the CDs. The passenger luggage X-ray scanners are very low powered and do not harm anything that I have had, DVDs, USB sticks, SSDs in laptops. It is impressive how well they see the luggage contents. The metal scanners you walk through can't have very high magnetic fields because of the distance between you and any coils and the worry that people with lumps of metal in them could be adversely affected. The body scanners will not affect the CDs and you can't carry tem into that.

Now hold luggage scanning could use more intensive X-rays and an idea of how they do this is here. http://science.howstuffworks.com/transport/flight/modern/airport-security6.htm Although I can't see that damaging CDs.

I guess the answer is to carry them as hand luggage and see what happens in the future.[/url]
Back to top
View user's profile Send private message 
Display posts from previous:   Sort by:   
Page 1 of 1 [15 Posts]  
Post new topic   Reply to topic View previous topic :: View next topic
 Forum index » Taking the Puppy out for a walk » Misc
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group
[ Time: 0.0520s ][ Queries: 12 (0.0041s) ][ GZIP on ]