Posted by: Sharon Fisher
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A few weeks ago, we were hearing all about how IBM researchers were developing teeny-weeny disk storage. Now we’re hearing about how other researchers are developing really fast disk storage. Unfortunately, the two technologies aren’t compatible, so you’ll have to settle for small or fast, not both. Noted one York University researcher in the multinational team:
Instead of using a magnetic field to record information on a magnetic medium, we harnessed much stronger internal forces and recorded information using only heat. This revolutionary method allows the recording of Terabytes (thousands of Gigabytes) of information per second, hundreds of times faster than present hard drive technology. As there is no need for a magnetic field, there is also less energy consumption.”
According to ScienceNOW, this is how it works:
[L]aser light heats up the gadolinium-iron alloy so incredibly fast—in 1/10,000 of a nanosecond—that at first only the iron atoms lose their mass orientation. The gadolinium atoms react more slowly in losing their magnetization. And once the iron atoms get hot enough and are free to pivot around, they prefer to align in the same direction as the gadolinium atoms. Then, as the material quickly cools and the orientations of the atoms freeze up, the iron and gadolinium atoms again prefer to point in opposite directions. But this time, it’s the slow-cooling gadoliniums that flip leading to a predictable overall reversal in the material’s magnetization.”
There’s only one problem. Remember the jokes about “write-only memory“? Turns out that, at least for the moment, that’s what the laser storage produces, because it isn’t clear how to read it again. “The only problem, at this point, is that while lasers are great at writing magnetic data, reading it is another challenge entirely,” notes DVICE.com. “The researchers seem to have used a fancy type of X-ray spectrometer that can read magnetic fields to check and see if they were writing the data that they thought they were, but until those get shrunk down to HDD component size (or someone comes up with something clever), we may be stuck just writing our data really really fast and not reading it ever again.”