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 Post subject: Mystery 3M laserdisc from eBay
PostPosted: 13 Jul 2020, 23:24 
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I recently purchased this 3M disc from eBay . It is thicker than a normal disc and I’m not sure what it is . I’m afraid to put it into my player in case it gets jammed . It has lines on it travelling to the centre of the disc kind of like a sliced cake . The seller thought it might be a worm data disc but didn’t really know . I just bought it on a whim thinking I might be buying a promo disc from way back when or something . If anyone can shed some light on it I would be very grateful . I’m new to the forum and new to laserdisc in general . Many thanks .
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 13 Jul 2020, 23:43 
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Hi bighamnegg.

Welcome - enjoy your time on here & with the LD format.

On the bottom of the label does it say Formated for Optimem?

I don't know what Optimem is but perhaps someone here may be able to help.

Hope you solve the mystery of your disc.

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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 13 Jul 2020, 23:52 
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Thanks man . Yes it does say formatted for optimum at the bottom . I appreciate the reply . Had a player years back and got rid of it when the kids came along but I always regretted it and knew I’d end up buying another at some point . Yeah I hope somebody knows something about this disc . Thanks man
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 00:05 
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I don't know about the Optimem part, maybe it is a plant pressing thing? However I found a great piece of information on 3M laserdiscs that may help you out. Hope this helps.

http://www.blamld.com/LaserDisc/3MManufacturing.htm
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 00:23 
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If the other side is a metal sheet then don't put it in your player it will mess it up unless you have an industrial player to take that extra weight.

Also you may try but it may be an NTSC disc.

Seems like its a CAV disc.

Try in your player at your own risk.
I don't think anything bad will happen but again this is at your own risk.
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 00:48 
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It looks like an LD, obviously a nearly full CAV LD of some writeable format. How much thicker is it?
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 02:19 
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je280 wrote:
I don't know what Optimem is but perhaps someone here may be able to help.


3rd and 4th hits on a Google search for "Formatted for Optimem", come on people :-)

(PC Magazine, February 1986)

Attachment:
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(May 1987 edition, starts on page 58, then continues to 101~102)

Quote:
This company [Optimem], originally spawned by Xerox Crop., is owned by Cipher Data Systems, and now makes optical disc drives. Larry Fujitani, Optimem's director of marketing, says Optimem -- in concert with 3M Co. -- is developing a "multifunctional" optical disc drive, meaning a drive that can use read-only, write-once, and erasable optical discs.


This is a magneto-optic disc (like a huge MiniDisc I presume or the old ZIP drives?) where the label is too big for a LD and the player wouldn't be able to spin (thickness) or detect the disc (label where the TOC should be).

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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 02:50 
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Dang, and I though recordable LDs were obscure useless junk. :) This thing is orders of magnitude more useless and obsolete.

Btw, Zip discs were totally magnetic, just floppies really. I think you’re thinking of SyQuest disks which were more like MDs.
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 03:51 
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signofzeta wrote:
Btw, Zip discs were totally magnetic, just floppies really. I think you’re thinking of SyQuest disks which were more like MDs.


You're right! Never owned one but had assumed -- because of the thick casing -- that it was magneto-optic.

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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 08:24 
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admin wrote:

3rd and 4th hits on a Google search for "Formatted for Optimem", come on people :-)

Julien


Okay Julien, I perhaps should have dug further as when I did a Google search on it all that I got were about Minimal Essential Medium products.

I will look more carefully in future :oops: .
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 10:31 
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Guys
Thank you all for your help with this . I wasn’t expecting this to be resolved so quickly . This disc is one of the double sided mentioned in the article . I have posted a comparison photo of the thickness compared to a normal disc and tried to get a picture to show the line detail on the surface of the disc . Your help has been much appreciated .
Cheers lads
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 10:37 
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For some reason it is not uploading my photos . I will give it another try later .
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 Post subject: Re: Mystery 3M laserdisc from eBay
PostPosted: 14 Jul 2020, 12:09 
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bighamnegg wrote:
For some reason it is not uploading my photos . I will give it another try later .


Hi, it could possibly just be that you haven't yet made enough postings, although I'm sure someone will be along shortly to confirm.
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