Author: Duncan Roberts
Date: 13:06:42 01/25/05
Go up one level in this thread
On January 24, 2005 at 12:41:43, Dann Corbit wrote: >On January 24, 2005 at 12:35:56, Dann Corbit wrote: > >>On January 24, 2005 at 12:33:49, Dann Corbit wrote: >> >>>On January 24, 2005 at 12:04:56, Dieter Buerssner wrote: >>> >>>>On January 24, 2005 at 11:53:38, Dann Corbit wrote: >>>> >>>>> It might require the square of that (so 50,000*50,000 acres). >>>> >>>>Dann, think again about this :-) Also, assume for a moment, you had given the >>>>area in square miles instead of acres. Now square that area, or in square light >>>>years - you will come to the conclusion, that almost no space at all will be >>>>needed ... . And of course, if you square an area, you don't have an area >>>>anymore, but rather something with dimentsion length^^4. >>> >>>Actually, a cube is a very good idea. The particular substance I described for >>>storing data is a doped crystal (rather inexpensive too). It is the same thing >>>that is used for dosimeters for people who walk around in nuclear reactors. >>>When ionizing radiation strikes the crystal, it leaves tracks that can be >>>measured. Using this principle, they are able to record a terrabyte in one >>>square centimeter. Interesingly, you can read the whole crystal at once with >>>CCDs. >>> >>>Now, suppose that we record in layers so that really we record data in 3 >>>dimentions. Instead of a terrabyte per square centimeter, we may get 1e36 bytes >>>per cubic centimeter. Now, suppose that we have some kind of loss with a factor >>>of one million. That would mean 1e30 bytes per cubic centimeter. >>> >>>A cubic meter of this crystal could store an awful lot of information. >>>Specifically, 1e90 bytes. >> >>Math spasm. Only 1e45 bytes, since we already had the square. >>But that looks like a pretty nice number for chess. And a cubic meter of >>crystal is certainly doable. Even if we need two or three of them. >> >>>So anything is possible, if we put our minds to it. > >Time for yet another retraction. Since a square centimeter gives 1e12 bytes, a >cubic centimeter is only 1e18 bytes. So a cubic meter is 1e18*100*100*100 = >1e24 bytes. Not bad, but a long way to go to store a chess tree. so in cubic kilometers 1e24 * 1000, * 1000 * 1000 = 1e33 bytes. assume 1e48 for all positions so 1e15 cubic kilometres needed or a cube of 2.5 by 2.5 of crystal should do the trick. duncan
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