• effects of magnets on video tape

    From Dan San@21:1/5 to All on Sat Nov 5 01:46:48 2016
    Floppy discs don't self destruct. The track alignment is just very fussy. If a floppy stops working it's probably just bad track and head alignment, can be due to temperature sometimes. HDDs use a system to find the tracks and align themselves, floppy
    discs lacked this, hence problem. Your discs aren't necessarily corrupt, with another drive or some tweaking they may work fine.

    On Friday, 16 August 2013 00:10:21 UTC+10, j wrote:
    On 8/14/2013 7:03 AM, Brian wrote:
    Paul <nospam@needed.com> wrote:
    Brian wrote:

    I don't need to erase the VHS tape but it was more of an experiment to find
    out if a VHS tape recording was easy to destroy. I was pleased with the >>> results as I was concerned that my tapes might get damaged if accidentally
    exposed to a magnetic force.
    Try a rare earth magnet extracted from a hard drive.
    That might be a bit stronger. The tape should make
    contact, for best effect. According to this, you can
    get 10x the field strength, compared to a regular magnet.



    Will if it takes a rare earth magnet in contact with the tape to change the recording then my tapes are safe from getting accidentally destroyed from a magnetic field. I must try a similar test on a computer floppy disc.

    My impression is that you can destroy a floppy disk by doing nothing,
    they self destruct on their own. I don't know why that is, but they have
    had to be the worst form of storage, probably even worse than zip disks.

    Magnetic fields fall off rapidly from their origin, unless designed otherwise. In the case of VHS tapes, the audio track is closest to the
    edge and the video luminance is FM modulated, naturally noise resistant.

    For the time, a pretty good design, not as good as Beta, but damned ingenious.


    Thanks for the link.

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