Can get stupid and useless stuff again – flea market

Today I found a stupid and useless audio CD on the flea market. I didn't even care what music is on the disc. It is one of the strangely shaped CDs (heart shaped in this case). Never owned such a thing before.

(full picture 360KB)
Heart_Shaped_CD.jpg
The red text above the barcode roughly translates to:
Careful: Not suitable for car CD players, CD changers and CD-ROM drives!
In case it doesn't play, rotate CD a bit and try again.
No liability for damages on playing device


Isn't that lovely? A real proof of love! Send your beloved a "♥️" heart shaped CD, which will most likely not work and might even damage his/her CD-player! This will surely increase your chances…

The imbalance of the heart shape is so extreme, that the CD players make noise like drilling into concrete. "Brrrrooooaaaarrrr!"

You know what: I'm the fearless testing Sina, so I inserted it into computer drives anyway. My concern was that a PC drive would spin up like normal after detection and make this thing explode… before I could send a "Set CD Speed 4x" command (lowest speed the drive will accept). It didn't explode, but it sounded scary for sure! This is anything but safe for the drive. I recommend not using such things.

Had to try multiple drives. This thing was way harder to copy than one with "Cactus Data Shield". Great copy protection (albeit also playing protection since many CD players also didn't play it)

Comments

Alright, lemme login again

These are far more common than you might think
https://en.m.wikipedia.org/wiki/Shaped_compact_disc
(or rather: were)

Not sure why you think they are *that* problematic, when:
* they state these are not compatible with Players that don't hold the disc inplace firmly
* people (who may) possess common sense wouldn't jame these in their car stereo


The biggest bummer here is area loss (and susequently data space loss)

This is what I believe might be usable area (light green)
Untitled384_20220730130458.png


Maybe "cold boy" will drop by to give us a free math lesson...
 
These are far more common than you might think
https://en.m.wikipedia.org/wiki/Shaped_compact_disc
(or rather: were)
Guess what: I know this article, but never had such a thing before.

Not sure why you think they are *that* problematic, when:
* they state these are not compatible with Players that don't hold the disc inplace firmly
* people (who may) possess common sense wouldn't jame these in their car stereo
They *are* problematic because they are imbalanced. Using those regularly will damage the mechanical parts.

I don't just think they are problematic, I tried it in multiple drives (stand alone players and PC drives). None of them sounded normal and some would refuse to play it.
As for the the higher speed on PC drives compared to old dedicated audio players ("They said to not use PC drives!!"):
Stand alone DVD players are often able to play DVD format video from CDs as well -- called CDVD or sometimes Mini-DVD (not to be confused with actual 8cm Mini-DVDs; "mini" in sense of memory capacity). To play full quality DVD video MPEG-2 stream from a CD, the drive has to spin pretty fast as well on the inner part. This means that currently available DVD players checking the inserted media don't differ that much from a laptop drive spinning up (not reaching the speed of proper full-sized drives).
===========

Concerning data space: My example has about 17 minutes of CDDA -- that is enough for singles and not too much below a normal 8cm CD (max. 21 to 25 minutes depending on track width). The data portion could get a little bigger than it is on this sample: There is about 0.5cm left to the edge on the narrowest part. The dark green ring of your graphic is a little thick (on my CD even more). It should be safe (for the data) too go a little further to the edge. About 20 minutes CDDA sound plausible.

With some tricks a CD-R shaped like this could hold > 250MB in Mode2 Form2
 
I too have not seen these before. Sounds like you had more luck at the car boot sale/yard sale/flea market than I did (granted I did not turn up until long after the games would have been snapped up -- seem to have to be out of the door by 5am for that one these days).

Saw mini ones (granted they were super popular for driver CDs for Chinese products, several flash carts even hard them), saw credit card/business card shaped ones, saw ones with all sorts of fun done with the top covers but that is new.

Marginally relevant at this point (strange media formats and all) but going it anyway
 
theres a hole in this heart. How sad.

I once had a CD explode into little bits in a CD-ROM drive. The drive was a little bit unconventional, because it had a cover that would be physically pushed open by the CD holder as it came out. A friend was hit slightly when the CD. It came out like a shotgun in little sharp bits, it blew the cover away. Fortunatly my friend didn't stand right in front of it. Facing it could have rekt his eyes.
 
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theres a hole in this heart. How sad.
Are you serious about this? It maybe a heart shaped object, but it is still a CD and needs a middle hole for being playable.

I once had a CD explode into little bits in a CD-ROM drive. The drive was a little bit unconventional, because it had a cover that would be physically pushed open by the CD holder as it came out. A friend was hit slightly when the CD. It came out like a shotgun in little sharp bits, it blew the cover away. Fortunatly my friend didn't stand right in front of it. Facing it could have rekt his eyes.
Ouch. The drives can go to about 10000 rpm. If a disc explodes at that speed, I do not want to get hit by the bits and pieces.
 
Are you serious about this? It maybe a heart shaped object, but it is still a CD and needs a middle hole for being playable.
I see your point, but the heart is a symbol of love. Having that symbol with a whole in the middle gives it a tragic spin. Imagine your loved one was untrue, how would you feel about the hole in in that CD. Symbols a powerful things, the stuff of big dreams.
Ouch. The drives can go to about 10000 rpm. If a disc explodes at that speed, I do not want to get hit by the bits and pieces.
I didn't know that. It was a serious shotgun spread blow, but less deadly.

 
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