what are hard drive platters made of

[dogcars]

 

[bobsmith1492]

Google it; I found this:

http://www.storagereview.com/guide2000/ref/hdd/op/mediaMaterials.html

 

[Ice Czar]

which pretty much covers Winchester technology even with perpendicular recording
http://en.wikipedia.org/wiki/Winchester_disk

what HAMR holds for the future hasnt been settled
http://en.wikipedia.org/wiki/Heat-assisted_magnetic_recording
http://www.fujitsu.com/downloads/MAG/vol42-1/paper18.pdf

 

[Steve]

Originally posted by: dogcars

Not Highly Technical.

 

[Ice Czar]

Originally posted by: sm8000

Originally posted by: dogcars

Not Highly Technical.

I assume you mean yet


looking through my Feb edition of Electronics Cooling they have a nice writeup in the technical data section regarding development of low CTE (coefficient of thermal expansion) alloys. And of course even with the current employment of distributed Servo Bursts for head placement and calibaration having the lowest possible CTE alloy that meets the other performance parameters holds distinct advantages. But of course to find further info might require some diligent patent searching

http://www.freepatentsonline.com/7031122.html
http://freepatentsonline.com/7135797.html
http://assignments.uspto.gov/assignment...HNOLOGY,%20INC.,%20A%20CORP.%20OF%20DE

technical enough now?

 

[Cogman]

Originally posted by: Ice Czar

Originally posted by: sm8000

Originally posted by: dogcars

Not Highly Technical.

I assume you mean yet

looking through my Feb edition of Electronics Cooling they have a nice writeup in the technical data section regarding development of low CTE (coefficient of thermal expansion) alloys. And of course even with the current employment of distributed Servo Bursts for head placement and calibaration having the lowest possible CTE alloy that meets the other performance parameters holds distinct advantages. But of course to find further info might require some diligent patent searching

http://www.freepatentsonline.com/7031122.html
http://freepatentsonline.com/7135797.html
http://assignments.uspto.gov/assignment...HNOLOGY,%20INC.,%20A%20CORP.%20OF%20DE

technical enough now?

Well, not really all that technical as the answer can easily be covered in one post. Really, to make this a Highly technical discussion, we would have to say something like

What materials are being used, and what limitations do they have? What is being researched to overcome those limitations and how far into the future will a product based upon it be? What are some of the new researching areas of hard drives? When will a plater be phased out, if ever? And what is your opinion about the current use of technology, good, bad, could be better? if so, how would you change it?

There you go, I want these questions answered (and then we will have a highly technical thread )

Really thought it is a good question, although the main post was missing some content.

 

[Steve]

Thank you Cogman. The OP as it stands seems like either curiosity/small talk, or else homework.

 

[StopSign]

Originally posted by: dogcars

Hard drive plattors are made of porcelain. They're extremely heat resistant but quite brittle. That's why you shouldn't drop hard drives on the floor.

 

[Xdreamer]

i ve heard everything from glass to aluminum. (but not wood ) the above sources cover it so i neednt say more.

 

[Googer]

Originally posted by: Ice Czar

Originally posted by: sm8000

Originally posted by: dogcars

Not Highly Technical.

I assume you mean yet


looking through my Feb edition of Electronics Cooling they have a nice writeup in the technical data section regarding development of low CTE (coefficient of thermal expansion) alloys. And of course even with the current employment of distributed Servo Bursts for head placement and calibaration having the lowest possible CTE alloy that meets the other performance parameters holds distinct advantages. But of course to find further info might require some diligent patent searching

http://www.freepatentsonline.com/7031122.html
http://freepatentsonline.com/7135797.html
http://assignments.uspto.gov/assignment...HNOLOGY,%20INC.,%20A%20CORP.%20OF%20DE

technical enough now?

No, that was in layman's terms...

 

[shortylickens]

I heard glass and porcelin were popular now because they are more stable at higher speeds.

 

[ramuman]

http://www.komag.com/technology/process.html Straight from the horses mouth. GMR is really an amazing and largely under appreciated advance in physics.

 

[patentman]

Originally posted by: ramuman
http://www.komag.com/technology/process.html Straight from the horses mouth. GMR is really an amazing and largely under appreciated advance in physics.

By GMR do you mean "giant magnetoresistance" or is that a typo and should read PMR, for perpendicular magnetic recording? Both technologies are major advances in the physics of magentic recording media (albeit one is applicable to the head, whereas the other is for the media)

In response to the OP's questions, most commercial platters (I'm assuming you mean the substrate and not the under, recording, protective and lubrication layers) are made from polycarbonate nowadays. Other materials, however, such as metals, allows, silicon wafers, ceramics, and diamond like carbon materials have been used. Polycarbonates are primarily used because the process and mechanism for epitaxially growing underlayers and magnetic recording layers is extremely well understood. Not to mention that polycarbonate is cheap and relatively easy to manufacture into ultraflat discs.

 

[Susquehannock]

Originally posted by: StopSign

Originally posted by: dogcars

Hard drive plattors are made of porcelain. They're extremely heat resistant but quite brittle. That's why you shouldn't drop hard drives on the floor.

Glass platers are also smoother than Aluminum Alloy ones. As indicated by the image on the page that Bob Smith provided.

Very informative by the way