Old 16th September 2003, 07:00   #1
nothin2g
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cd hole diameter?

hi,
why is the hole im the middle of a cd 15 mm? why not 16mm or 14mm?
there's a real reason, but i can't find it with google. any ideas?

sorry for bad english,
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Old 16th September 2003, 07:04   #2
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It's like the width of railroad tracks. They just have to agree on something, or else only Sony players can play Columbia CDs etc.

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Old 16th September 2003, 07:08   #3
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Probably because its very close to the average width of the tip portion of your finger.

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Old 16th September 2003, 07:23   #4
nothin2g
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i've found something:
Quote:
> The hole in the middle of a CD was sized to match
> a coin local to where the CD standard was set?

Correctamundo. Philips and Sony were the two companies in
question, and Philips chose the inside diameter to match the exact
same size of the Dutch dime -- at 18mm, one of the smallest size
coins currently in circulation in the world (if not the smallest).
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Old 16th September 2003, 22:36   #5
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18mm? I just measured one of my cds... They're 15mm like nothin2g said.

Or was that a typo?
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Old 16th September 2003, 22:59   #6
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well..someone has to have a Dutch dime....to confirm it....
when they say dutch...what country do they mean?

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Old 16th September 2003, 23:00   #7
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Probably Holland.

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Old 16th September 2003, 23:11   #8
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hmm...well i dont have any coins from holland...but a 1cent from germany almost fits into my cdr...

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Old 16th September 2003, 23:18   #9
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almost same with a US dime

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Old 16th September 2003, 23:40   #10
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Dutch= The Netherlands and I think my dad may have one(coin) in his collection. I'll have to check it out.
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Old 17th September 2003, 00:17   #11
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I'd have to agree that Philips and Sony had to set standards. Now for the size of the diameter hole, there has to be a set size for the entire diameter.
Plus there are other standards such as the diameter of a cd 1/2 that size thats so they can fit in jewel cases that are 3 1/2 inch. Why did then make 3 1/2 inch floppies? Why not 3 1/4 inch?

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Old 17th September 2003, 04:31   #12
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I have a coin from South Africa it's one whatever the hell it is that they call their currency and it fits the hole of the CD perfectly, I just measured it and the coin is 14.80mm and the hole on the CD is 15.00mm.
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Old 17th September 2003, 13:02   #13
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oh netherlands...well i have a couple of those....

hey! thats cool! it fits perfectly. wow.....i am so amazed

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Old 17th September 2003, 17:05   #14
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the guys from philips and sony are crazy ppl .)
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Old 17th September 2003, 18:31   #15
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I heard it was the size of bill gates' penis.
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Old 17th September 2003, 18:34   #16
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In more interesting news, nothing happened.

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Old 17th September 2003, 18:36   #17
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its a useless yet interesting fact that you can use to win money off your friends

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