Replace magnetic with optical

  • Thread starter Thread starter Radium
  • Start date Start date
Radium reminds me of certain bright, but uninformed, ten-year-olds
that I have met. Is there a possibility that he has some kind of
condition?
Click to expand...

I've been diagnosed with Asperger's syndrome.
 
"no magnetism, no electricity" = no light
Click to expand...

Sorry. I was talking about the use of electricity/magnetism for power,
communication, and storage.

I am aware that light is made of electric and magnetic fields and that
a laser does involve electrons at some level to produce its light even
if the laser is not powered or pumped by electricity.
 
HDD data density is over 10 times more than 50 GB BR disk.

What "risk of cancer" are you talking about? Are you completely clueless,
like dumb blonde?
 
HDD data density is over 10 times more than 50 GB BR disk.
Click to expand...

What if -- in my theoretical optical HDD -- the recording/playback
laser is made thinner and the optical platters made the same size as
magnetic platters, and if this optical HDD has the same amount of
platters as magnetic HDD?
What "risk of cancer" are you talking about?
Click to expand...

Direct exposure to extremely short-wave radiation can cause cancer.
You know, melanomas, etc. are often associated with frequent exposure
to short-wave UV from sunlight.

As for 400 nm, this is long-wave UV, and if often referred to as
"black light". So 400 nm is safe UV.
 
What if -- in my theoretical optical HDD -- the recording/playback
laser is made thinner and the optical platters made the same size as
magnetic platters, and if this optical HDD has the same amount of
platters as magnetic HDD?
Click to expand...

LOL

What if - since we're allowed to make up imaginary hardware,
we consider a hypothetical hard drive with thinner platters
about the same size as Texas that spin fast enough to pull
small asteroids in and hold a few Googlebytes each?


Direct exposure to extremely short-wave radiation can cause cancer.
You know, melanomas, etc. are often associated with frequent exposure
to short-wave UV from sunlight.

As for 400 nm, this is long-wave UV, and if often referred to as
"black light". So 400 nm is safe UV.
Click to expand...

I take it you don't go outside very often.
 
kony said:
LOL

What if - since we're allowed to make up imaginary hardware,
we consider a hypothetical hard drive with thinner platters
about the same size as Texas that spin fast enough to pull
small asteroids in and hold a few Googlebytes each?
Click to expand...

A "thinner" laser is not fantasy. Search for "near field recording".

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Radium said:
I've been diagnosed with Asperger's syndrome.
Click to expand...


Okee Dokee, shall we presume you are not Schizophrenic then?


Diagnostic Criteria For Asperger's Disorder

A. Qualitative impairment in social interaction, as manifested by at least
two of the following:
1.. marked impairments in the use of multiple nonverbal behaviors such as
eye-to-eye gaze, facial expression, body postures, and gestures to regulate
social interaction
2.. failure to develop peer relationships appropriate to developmental
level
3.. a lack of spontaneous seeking to share enjoyment, interests, or
achievements with other people (e.g. by a lack of showing, bringing, or
pointing out objects of interest to other people)
4.. lack of social or emotional reciprocity
B. Restricted repetitive and stereotyped patterns of behavior, interests,
and activities, as manifested by at least one of the following:
1.. encompassing preoccupation with one or more stereotyped and restricted
patterns of interest that is abnormal either in intensity or focus
2.. apparently inflexible adherence to specific, nonfunctional routines or
rituals
3.. stereotyped and repetitive motor mannerisms (e.g., hand or finger
flapping or twisting, or complex whole-body movements)
4.. persistent preoccupation with parts of objects
C. The disturbance causes clinically significant impairment in social,
occupational, or other important areas of functioning
D. There is no clinically significant general delay in language (e.g.,
single words used by age 2 years, communicative phrases used by age 3 years)

E. There is no clinically significant delay in cognitive development or in
the development of age-appropriate self-help skills, adaptive behavior
(other than social interaction), and curiosity about the environment in
childhood

F. Criteria are not met for another specific Pervasive Developmental
Disorder or Schizophrenia
 
Radium said:
What if -- in my theoretical optical HDD -- the recording/playback
laser is made thinner and the optical platters made the same size as
magnetic platters, and if this optical HDD has the same amount of
platters as magnetic HDD?


Direct exposure to extremely short-wave radiation can cause cancer.
You know, melanomas, etc. are often associated with frequent exposure
to short-wave UV from sunlight.

As for 400 nm, this is long-wave UV, and if often referred to as
"black light". So 400 nm is safe UV.
Click to expand...

What about a 3 dimensional media, like an optical version of the old bubble
magnetic memory with X/Y/Z read/write vectors?
Perhaps then we could have small removable 1/2 or 1 inch cubes that
contained huge volumes of data...
 
BogusID said:
What about a 3 dimensional media, like an optical version of the old bubble magnetic memory with X/Y/Z read/write vectors?
Perhaps then we could have small removable 1/2 or 1 inch cubes that contained huge volumes of data...
Click to expand...

Holographic memory. It already exists in the lab, and is being
developed, AFAIK.

Followups trimmed a bit.

Martin
 
Sam Goldwasser said:
A "thinner" laser is not fantasy. Search for "near field recording".
Click to expand...

In the same vaporware cathegory.

On a modern HDD platter, a bit takes less than 100*20 nm. What wavelength
you need to focus light to a comparable spot?
 
Radium said:
As for 400 nm, this is long-wave UV, and if often referred to as
"black light". So 400 nm is safe UV.
Click to expand...

In a properly designed optical drive, laser never leaks outside. Anyway, its
power is so low compared to sunlight, that there is no danger in occasional
exposure (other than direct eye exposure).
 
Fleetie said:
Holographic memory. It already exists in the lab, and is being
developed, AFAIK.
Click to expand...

I think it's out of the lab and you can buy parts to make them now. See
this month's Electronic Design for spatial light modulator module.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
 
Sam Goldwasser said:
I think it's out of the lab and you can buy parts to make them now. See
this month's Electronic Design for spatial light modulator module.

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above
is
ignored unless my full name AND either lasers or electronics is included
in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.
Click to expand...


Yup, that's the stuff!

<http://sbir.nasa.gov/SBIR/abstracts/97/sbir/phase1/SBIR-97-1-24.03-2191.html>
 
Hi:

Why do hard disc drives use magnetic discs?

Since non-volatile flash RAM chips are not yet feasible for HDD-
substitution, why not replace the magnetic platters with optical ones
that use 400 nm lasers to write, read, erase, and re-write data?
Click to expand...

[snip cobblers]

You might be interested in this device:
http://techon.nikkeibp.co.jp/english/NEWS_EN/20050608/105586/
Optware Corp., a developer of holographic data storage systems, is
planning to release a Holographic Versatile Card (HVC) media product
around the end of 2006. The card capacity is expected to be 30 GB. The
company aims to price the product around ¥100. Optware also intends to
set the price of a reader device lower than ¥200,000 and a reader/
writer device lower than ¥1 million. The launch of these HVC-related
products is planned to coincide with the standardization of the
technology, expected in December, 2006, by Ecma International, an
organization promoting standardization of information and
communication technologies. The company also revealed photos of
mockups. Dimensions of the card are almost the same as those of a
credit card, while the drive system is designed to be the size of a
surface-mounted hard disc drive system.
Click to expand...

I haven't seen or heard any more of this device.

30 GB in the size of a credit card is good, but I get the feeling that
USB thumb drives will be there soon.
 
A "thinner" laser is not fantasy. Search for "near field recording".
Click to expand...

It is an idea based loosely on a few technologies still
maturing. Until there is an actual product that allows
abandoning magnetic hard drives as Radium suggests, it is
all just fantasy.
 
It is an idea based loosely on a few technologies still
maturing. Until there is an actual product that allows
abandoning magnetic hard drives as Radium suggests, it is
all just fantasy.
Click to expand...


Any chance of replacing electricity -- as a power source -- to 400nm
laser light pumped by D-T fusion in the next 20-30 years?
 
Radium said:
Any chance of replacing electricity -- as a power source -- to 400nm
laser light pumped by D-T fusion in the next 20-30 years?
Click to expand...

Yes, almost exactly the same chance as you posting something
sensible in that same time span, as it turns out.

Bob M.
 
Radium said:
Since non-volatile flash RAM chips are not yet feasible for HDD-
substitution, why not replace the magnetic platters with optical ones
that use 400 nm lasers to write, read, erase, and re-write data?
Click to expand...
because this procedure would likely make use of phase changes in organic
dyes, which unfortunately won't work for any reasonable number of writes.
plus you will hit the ultimate diffraction limit for the particular
wavelenght you are using, which is a major problem at the required data
density.
Unless, of course, you plan on using holograms.

Optical platters using 400 nm lasers would surely have advantages over
magnetic platters. More data per area and less vulnerability to
environmental magnetic disruptions -- to name a few.
Click to expand...

sure?

HDs are pretty well shielded.
Too short and you increase your
risk of cancer. So use 400 nm and dump those useless magnetic discs.
Click to expand...

no risk of anything, the laser light is within the HD casing.
However UV light will effectively destroy the substrate.
 
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