Register FAQ / Rules Forum Spy Search Today's Posts Mark Forums Read
Go Back   MacRumors Forums > Apple Systems and Services > Mac Basics and Help

Reply
 
Thread Tools Search this Thread Display Modes
Old Mar 21, 2010, 09:18 PM   #1
Luba
macrumors 6502
 
Join Date: Apr 2009
Put a magnet to a HDD or old floppy disk to "erase" them?

If I put a magnet to one of those old floppy disks or to a hard disk drive would that in effect be a secure erase?

But interesting I put a magnet on a hard disk drive platter and the magnet had no "pull" effect on it?? Perhaps the shiny silver color coating deflects the effect of magnetism??
Luba is offline   0 Reply With Quote
Old Mar 21, 2010, 09:21 PM   #2
GoCubsGo
macrumors Nehalem
 
GoCubsGo's Avatar
 
Join Date: Feb 2005
You'll need a very powerful magnet for it to actually matter.
Why not just erase via OS X or Windows?
__________________
Because I'm a smartass.
GoCubsGo is offline   0 Reply With Quote
Old Mar 21, 2010, 09:22 PM   #3
-aggie-
macrumors Demi-God
 
-aggie-'s Avatar
 
Join Date: Jun 2009
Location: Where bunnies are welcome.
It would screw it up, but no, it would not be a secure erase. There are ways to get the parts you didn't magnetize off.
__________________
Google with site:macrumors.com as a parameter.
DFU Mode
-aggie- is offline   0 Reply With Quote
Old Mar 21, 2010, 09:22 PM   #4
GGJstudios
macrumors Westmere
 
Join Date: May 2008
Busting the Biggest PC Myths

Quote:
Magnets zap your data.
  • For venerable floppies, this statement holds true.
  • Fortunately, most modern storage devices, such as SD and CompactFlash memory cards, are immune to magnetic fields.
  • The same goes for hard drives. The only magnets powerful enough to scrub data from a drive platter are laboratory degaussers or those used by government agencies to wipe bits off media.
Want to erase data from a hard drive you plan to toss? Don't bother with a magnet. Overwrite the data that is stored on the media instead.

Last edited by GGJstudios; Mar 21, 2010 at 09:27 PM.
GGJstudios is offline   0 Reply With Quote
Old Mar 21, 2010, 09:22 PM   #5
CJS7070
macrumors 6502a
 
CJS7070's Avatar
 
Join Date: Dec 2008
Location: Chicago, IL
Keep in mind that hard drives are enclosed in faraday cages, so the magnet wouldn't have the full effect of an exposed platter... and that would destroy the drive right then and there.
CJS7070 is offline   0 Reply With Quote
Old Mar 21, 2010, 09:33 PM   #6
Luba
Thread Starter
macrumors 6502
 
Join Date: Apr 2009
I never saw a hard disk platter up close and personal, so a friend took it out. He drilled out the special screws in HDD case and took out the platter. Interestingly, inside the HDD case there was a strong magnet in there!

BTW, what is a faraday cage?

Quote:
Originally Posted by CJS7070 View Post
Keep in mind that hard drives are enclosed in faraday cages, so the magnet wouldn't have the full effect of an exposed platter... and that would destroy the drive right then and there.

Last edited by kainjow; Mar 21, 2010 at 09:54 PM. Reason: merged posts
Luba is offline   0 Reply With Quote
Old Mar 21, 2010, 09:37 PM   #7
GGJstudios
macrumors Westmere
 
Join Date: May 2008
Quote:
Originally Posted by Luba View Post
BTW, what is a faraday cage?
Google is your friend:
http://en.wikipedia.org/wiki/Faraday_cage
GGJstudios is offline   0 Reply With Quote
Old Mar 21, 2010, 11:11 PM   #8
Flynnstone
macrumors 65816
 
Flynnstone's Avatar
 
Join Date: Feb 2003
Location: Cold beer land
Quote:
Originally Posted by CJS7070 View Post
Keep in mind that hard drives are enclosed in faraday cages, so the magnet wouldn't have the full effect of an exposed platter... and that would destroy the drive right then and there.
Faraday Shields block electric fields NOT magnetic fields.

A strong magnetic will "disturb" a floppy, like 5 1/4"
A really strong magnetic will "disturb" a 3.5" floppy.
and even stronger for a hard drive.
I use disturb because its not necessarily erasing it.

Just erase it using OS X or ...
or use a secure erase tool.
or use a drill and hammer etc and physically destroy it.

Quote:
Originally Posted by Luba View Post
I never saw a hard disk platter up close and personal, so a friend took it out. He drilled out the special screws in HDD case and took out the platter. Interestingly, inside the HDD case there was a strong magnet in there!

BTW, what is a faraday cage?
I've got a couple I could post some pictures.

The strong magnetic is for the voice coil head actuator.
__________________
"You can't solve you're problems with the same level of thinking that created the problems." - Einstein
New iMac 24"/G5 1.8/...

Last edited by kainjow; Mar 22, 2010 at 01:50 AM. Reason: merged posts
Flynnstone is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Systems and Services > Mac Basics and Help

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
thread Thread Starter Forum Replies Last Post
New Mac, want to swap HDDs from old to new Surely Mac Basics and Help 14 Aug 25, 2011 06:59 PM
instruction: Adding magnets to a the Incase magazine case pkshiu iPad Accessories 0 Apr 10, 2011 01:05 PM
Floppy Disks in Mac OS X Hildron101010 OS X 7 Mar 20, 2011 06:29 PM
How to transfer a 4+gb file to a HDD on MacBook? Halvard Mac Basics and Help 3 Feb 23, 2011 12:55 PM
Where to buy 800k 3.5" floppy disks for a Macintosh Plus? kg1984 Apple Collectors 3 Mar 3, 2009 09:41 AM


All times are GMT -5. The time now is 07:43 PM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC