A Terabyte of Data on a Laptop Hard Drive

KaosConMan writes: "TechnologyReview.com has an article describing a new technique being developed by General Electric and IBM to further decrease the size needed to magnetically store data. This new technique could produce 150 gigabits per square centimeter-- that's ~57,000 songs on an iPod or a terabyte on a laptop size hard drive!"

Comments

Posted previously.

[Wohali]

Double-check what you've posted already, guys, please...

Circular?

[NeuroManson]

I hope they aren't thinking of using the design that the example shows, it's an awfully inefficient use of space... Would be more effective to either make the particles pyramidic, that way you could have an even smaller point for magnetic fields and since it tapers at the tip, less chance for "crosstalk" from one particle to the next... Since we're talking something on a molecular scale, there would probably be less in the way of drag or heat buildup, whereas the cylindrical design is just begging for it...

Re:Circular?

[clark625]

You would think that a pyramid would be a neat advance, but it's probably not feasable. The costs associated currently are too high for consideration.

The problem with pyramids is the formation. Hard drive manufacturers like to use Si, polymers, metals, and the like. Doing a photolithography step on them isn't difficult--but finding an etchant that will prefer to etch in a pyramidal shape is rather tough. If you can find one, it usually will etch down such that you end up with pyramids facing into the substrate.

Not that it can't be done. I recall some work done creating pyramids on GaAs substrates. It may be extendable to other material systems as well. But GaAs is a zincblend crystal structure--not a diamond structure like Si is. The zincblend readily makes itself agreeable to off-axis etching (especially if you get the proper offcut wafer).

Maybe if the polymer could be self-assembling and would itself produce the desired pyramidal shapes, then everyone would be happy. Doing a metalization step over top of that would not be difficult at all. But I'm not terribly great at dealing with polymers--I don't know where the limits of self-assembly are. I'm sure someone else does, though--and I know of several journal papers you might consider.
Anyways--your idea is good, but it's an ideal. At this moment, there doesn't really exist a practical way to make metalized pyramids without steps that would either be prohibitively expensive (I'm talking processing time here), or steps that would require too large of feature size.