best storage method for archiving video camera files?

Discussion in 'Amateur Video Production' started by Brian, Feb 19, 2013.

  1. Brian

    Brian Guest

    After reading what you wrote, as any experiment I put the metal lid of a
    cake tin in front of a audio speaker and moved a compass pass the cake tin
    lid. The compass needle detected the magnetic force from the speaker and
    jumped towards the speaker. So cake tins are out.
     
    Brian, Feb 20, 2013
    #21
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  2. I believe you have to fully enclose the object to be protected by the
    ferrous metal container.
    Gauss's Law or sumpn..... :)
     
    Existential Angst, Feb 20, 2013
    #22
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  3. Brian

    Paul Guest

    When the power supply is not running, the effect would be minimal
    to non-existent.

    *******

    I can relate a case where there was an issue though.

    Years ago, we built a computer at work, and placed a 200W
    open-face power supply, next to a disk drive. We started
    noticing a background error rate. Pulling the drive and
    testing elsewhere, there weren't any errors to be seen.
    Turned out, electromagnetic interference ("radio signals")
    from the switching power supply, were entering the hard drive
    electronics, and screwing up data as it moved through
    the controller. (I didn't work on this, but my manager
    provided details later.) The fix was to move things
    around inside the chassis, and install some kind of shield,
    and then the problem stopped.

    Modern ATX supplies work a little bit better than that now.
    Those old power supplies were pigs, in many ways, and we had
    more problems than that with those style power supplies.

    So rather than magnetism causing a problem, it was RF interference.
    And the susceptibility of the disk drive controller board
    was as much to blame, as emissions from the power supply.

    Paul
     
    Paul, Feb 20, 2013
    #23
  4. Brian

    Steve King Guest

    Try the same experiment with the cake tin removed from the vicinity of the
    speaker. My experience with compasses aboard boats and aircraft is that
    they are affected by the proximity of any ferrous metal. That's why they
    put correcting magnets within the case of precision compasses, to cancel out
    the effects of nearby ferrous metals and stray magnetic fields. I remember
    a sailing acquaintence telling the story of his wife putting her scissors on
    a little shelf situated below a bulkhead mounted compass. When the
    shoreline was in sight, after a 70 mile night sail across Lake Michigan,
    South Haven, his destination, was nowhere in sight. It had to be either
    north or south of his position. He chose North. Eventually landmarks on
    shore matched to chart details allowed him to iodentify his position. He
    was 15 miles north of South Haven harbor entrance. He spent an hour sailing
    north, so he figured that he was 10 miles off course, when he arrived near
    the shoreline. The scissors were causing about an 8 degree error in his
    steering compass. This was before GPS and electronic chart plotters, which
    would have alerted the skipper that something was amiss.

    Steve King
     
    Steve King, Feb 20, 2013
    #24
  5. Brian

    Mike S. Guest

    $15 bulk-packaged LG drives, off the shelf at Micro Center (or your
    favorite auction site) handle them. In fact, in my case, I discovered the
    discs _after_ buying the drive, while wondering what the logo on the
    faceplate meant.
     
    Mike S., Feb 20, 2013
    #25
  6. Brian

    Brian Guest

    I'll have to think of a better test.
     
    Brian, Feb 20, 2013
    #26
  7. Brian

    Brian Guest

    Do you remember how they shielded it?
     
    Brian, Feb 20, 2013
    #27
  8. Brian

    Brian Guest

    So if I wrapped a tape in metal foil then would it be safe from a magnetic
    field?
     
    Brian, Feb 20, 2013
    #28
  9. Brian

    Brian Guest

    I wonder how the scissors became magnetic or was it due to the scissors
    being metal. They must have been very close to the compass to have an
    effect on it.
    After trying different things using a compass it seems that audio speakers
    have the biggest effect on the compass.
    I know someone who use to put his VHS tapes on top of a fall standing
    speaker and for a while could not understand why his recordings were
    getting damaged.
     
    Brian, Feb 20, 2013
    #29
  10. Brian

    Steve King Guest

    The scissors were on a shelf within an inch or two from the back of the
    compass. They didn't need to be magnetized.

    Steve
     
    Steve King, Feb 20, 2013
    #30
  11. There are earlier remarks in this thread about which metals protect from
    magnetism and which don't.

    Only magnetic materials will work.
     
    Gene E. Bloch, Feb 20, 2013
    #31
  12. Actually I had the same discovery after buying an LG Blu-ray drive. I
    hadn't heard of M-Discs before (unlike you, I haven't bought any yet,
    but of course the option remains...)
     
    Gene E. Bloch, Feb 20, 2013
    #32
  13. For reading, M-Discs are compatible with CDs & DVDs. You need special
    drives only for writing them (and as Mike S. has pointed out, the drives
    needn't be expensive).
     
    Gene E. Bloch, Feb 20, 2013
    #33
  14. Brian

    Mike S. Guest

    Great minds, Gino ... :)

    I've burned some irreplaceable family videos and an archive of old digicam
    photos to a handful of these. Since it's a redundant backup anyway, I
    won't cry if these become unreadable. So far they can be read by every
    optical drive I've tried. After the initial buzz I see very little about
    these discs; that could be a sign that the product line won't last.
     
    Mike S., Feb 21, 2013
    #34
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