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Index > Heap > use dvd-drive as microscope?

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taeyun



Joined: 12 Jan 2014
Posts: 42
Location: south korea
taeyun
I don't know if it is practical or not.

1. paste what you want to see on a dvd
2. put it into dvd-drive
3. burn with 1s
4. rip off the pasted thing
5. put dvd into dvd-drive
6. read 0s to get a monochrome image

is it a bad idea?

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Post 12 Apr 2014, 04:31
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sid123



Joined: 30 Jul 2013
Posts: 340
Location: Asia, Singapore
sid123
Yes.
Post 12 Apr 2014, 07:53
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taeyun



Joined: 12 Jan 2014
Posts: 42
Location: south korea
taeyun
sid123 wrote:
Yes.

will you tell me a reason?

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Post 12 Apr 2014, 07:55
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sid123



Joined: 30 Jul 2013
Posts: 340
Location: Asia, Singapore
sid123
Because we already have electronic microscopes......
EDIT: Never tried it, hmm... let's see what I get
Post 12 Apr 2014, 07:57
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taeyun



Joined: 12 Jan 2014
Posts: 42
Location: south korea
taeyun
sid123 wrote:
Because we already have electronic microscopes......
EDIT: Never tried it, hmm... let's see what I get

it must be interesting if you get some result!

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Post 12 Apr 2014, 08:15
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
I posted something related once, where CDs were used as a sort of petri dishes to grow micro organisms on them and then read as CD audio to check for distinctive noise patterns to determine what kind of organism did grow on the surface. See if you can find my really old post...
Post 12 Apr 2014, 17:22
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axlucas



Joined: 02 May 2014
Posts: 66
Location: Argentina
axlucas
Uhm... it sounds interesting, though complicated and probably impossible. The DVD drive usually refuses to read/burn DVDs with minimal physical damage, so imagine what would happen if you pasted something on one. But suppose you do and it does want to burn it, you must also consider that DVDs are not written as sequences of 1's and 0's the same way as a magnetic disk. DVDs have "hills and valleys" and if I remember correctly, the switching from a hill to a valley or vice versa is taken for a physical one and the continuation of a hill or valley is taken for a physical zero. Then, a group of, say, 18 physical 1's and 0's is taken together and translated to an 8bit actual byte with logical 1's and 0's. Something like that.
Another thing: what would the DVD burning process do on the thing you paste on the DVD? You need to make sure it's not transparent to the laser.
One last point: DVDs, like CDs, do not use a fixed angular velocity, but rather, try to keep a fixed density. This means that it will require some additional math to estimate which two points were side by side in two parallel "tracks" of the disk. Remember, also, that DVDs don't have concentric circles, but one continuous spiral instead.

All this, I read some long time ago, so I may as well be pretty wrong about some things, but this is all just for considering the odd things that might be considered if such an experiment were to be done Razz
Post 02 May 2014, 23:26
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