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Thread: DVDs Poorly Manufactured Off Centre.....Drive Wear?

  1. #1
    Join Date: Apr 2017

    Location: Cheshire UK

    Posts: 151
    I'm Martin.

    Default DVDs Poorly Manufactured Off Centre.....Drive Wear?

    I have just finished watching a comedy DVD where the disc made a spinning noise like a fridge compressor as it was clearly spinning unevenly. The unit was vibrating in an unhealthy way.

    It did this in two machines...One games console and one trusty Toshiba I have. Picture quality and tracking was perfect but I shouldn't have to put up with noise and vibration

    Im a bit miffed as I've had this problem a few times recently. It was a new DVD and didnt look polished or anything. Its a bit hard to tell how off centre it is but something makes it spin unevenly

    It can't be doing the motor spindle any favours at the high RPM. Apart from the noise it generates, it must be reducing the life of the drive and I'm not best pleased

    It was only a couple of pounds posted so not worth sending back. It seems the quality of disc manufacture is getting worse either in rough edges or a hole pressed off centre. If it was full priced it would have been going back. I will watch out for this in future. It was very cheap including postage but I wonder if there are bad batches of them.

    Has anyone else noticed this issue with DVDs?

    Cheers
    Martin
    Last edited by Minstrel SE; 20-05-2017 at 06:14.

  2. #2
    Join Date: Feb 2017

    Location: Sheffield

    Posts: 101
    I'm Mark.

    Default

    I have this on some CD's I have, but not to that extent, as I use a Bel Canto CD2 which is open top, cd is held with a puck, if the cd is good when it plays you hear a very very quiet sound from the cd player almost silent, if the pressing if slightly off centre you can just hear the drive moving the head to compensate, this is still a very quiet sound. but is something you would not notice in an enclosed player.

    Your disc must have been very bad.
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  3. #3
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 35,444
    I'm Grant.

    Default

    Can be a few reasons. As you say, off centre is one. The way they are printed can cause it too as can poorly finished edges. Warping and disc thickness too
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    DENON DV2900 - TWIN PRO MONOBLOCK AMPLIFIERS - XIANG SHENG DAC\PRE\HEADPHONE AMP - AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER23, SPOTIFY PREMIUM - SMSL M6 MINIDAC - FULL RANGE TWIN TELEFUNKEN's - Q ACOUSTIC BT3 actives - CANTON SUB - MAINS REGENERATED AND FILTERED.

  4. #4
    Join Date: Apr 2017

    Location: Cheshire UK

    Posts: 151
    I'm Martin.

    Default

    Yes and it doesnt look massively off centre but the edges are a bit rough. I suppose extra thickness or roughness around the rim would do it but its probably off centre by enough to cause this.

    Ive had some cds do this in a laptop drive but I have never heard it in a decent cd player.

    Its just a bit annoying as I was going to put this with the other live comedy events as a collection and now Ive got a duff DVD. I dont want the thing buzzing away while I watch it.

    I think quality control is going down the pan. They certainly seem more cheaply made than the discs I was buying in earlier decades.

    Oh well its not worth sending it back. It only cost me 1.88 sealed new. Recorded in 2010, I presume its now heavily discounted to shift old stock with a low demand.

    Thanks
    Martin
    Last edited by Minstrel SE; 20-05-2017 at 08:32.

  5. #5
    Join Date: Apr 2017

    Location: Cheshire UK

    Posts: 151
    I'm Martin.

    Default

    Just to add that quality control must be going down the tubes. I read that they stamp discs out for 79p but I would have thought that the machinery used to make these discs ensures some quality control as standard. If they can get it right most times, what's going wrong?

    The problem disc has a very rough edge which looks like a trail of glue or plastic going up and down in a rollercoaster motion. I have been studying it and its just not acceptable for something that spins so fast. I feel like smoothing the edges as uniformly as possible to prove a point

    The next disc I bought was lovely, smooth and ran beautifully in all my video players.

    Ive had this problem occasionally with DVDs and CDs...They have usually been second hand/very cheap and not cost effective to compain about when I cant claim return postage.

    If I ever get this problem with a new disc at normal retail price, it will be going back

  6. #6
    Join Date: Dec 2015

    Location: vancouver

    Posts: 642
    I'm danilo.

    Default

    Dunno IF you care ? I did, but haven't bothered for a while.
    It is quite simple to Balance a CD.
    Cobble up and Fit a diy spindle / axle to it's centre hole.
    Place a pair of Neo magnets on the jaws of a vise.
    Touch one end of the axle to a Magnet.
    Wind the other jaw magnet within a ~1/4" of the other axle end.
    Which will be magnetically levitated (almost) with V little if any friction.
    Place a bit of tape on the light side of the disc as required as balancing weight.

    Once :-)one has cobbled together the axle contraption bit, the CD balancing takes less than a minute.
    My audio bits: Thorens / diy phono, CD/dvd player(s), diy pre, F6, Tannoy Golds in my boxes / my xovers, and of course all strung together with basic diy Wires
    Lots of Cd's, yet more audio files, a couple of hundred semi worn Lps.

  7. #7
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 27,768
    I'm Geoff.

    Default

    Sounds good. One would have to ensure critically accurate machining and balance of the arbor (axle) and that it would hold the CD exactly concentrically.
    Last edited by walpurgis; 28-05-2017 at 16:40.
    Mr. Tact!

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  8. #8
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 35,444
    I'm Grant.

    Default

    Or you can sand the edge if its rough
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    DENON DV2900 - TWIN PRO MONOBLOCK AMPLIFIERS - XIANG SHENG DAC\PRE\HEADPHONE AMP - AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER23, SPOTIFY PREMIUM - SMSL M6 MINIDAC - FULL RANGE TWIN TELEFUNKEN's - Q ACOUSTIC BT3 actives - CANTON SUB - MAINS REGENERATED AND FILTERED.

  9. #9
    Join Date: Apr 2017

    Location: Cheshire UK

    Posts: 151
    I'm Martin.

    Default

    Yeah I will make a magnetic bearing NOT which leaves option B with my fine grade wet and dry paper.

  10. #10
    Join Date: Apr 2015

    Location: Central Virginia

    Posts: 550
    I'm Russell.

    Default

    I think DVD's spin faster than CD's? Which makes it even worse if they are out of round. There is a machine for sale at Music Direct, they've had it for many years, a lathe to cut the edge of the CD perfectly round and with the correct bevel to reflect the light away, something like that. It's expensive! But, truing your CD's has been a thing for many years, along with green pens, green mats, etc. but if DVD's are spinning faster, perhaps truing them makes more sense?


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