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Recording to Holographic Media

Reading from Holographic Media
InPhase has packed 515Gb in a square inch of holographic media and plans 300GB drives and media later this year

A story on Physorg.com is reporting that InPhase Technologies, a company focused on holographic storage, has produced a medium capable of holding 515Gb of data per square inch which overshadows the capacity of the highest density magnetic platters currently in production. InPhase was a big hit at this year's CES when they demonstrated its holographic storage prototypes and showed off the various media options but said that initial products will only use the red laser, as opposed to blue and green, for reasons of cost.

Holographic storage has been a topic of strong conversation in the storage community for a few years now since the need for alternative recording methods has become more apparent. Magnetic recording methods are approaching their physical limits because of the superparamagnetism phenomenon. Superparamagnetism occurs when the magnetic bits of data on magnetic media, such as hard disk drives, are placed so close together that they disrupt each others' "on/off" state, corrupting the data and making the media unreadable.

To buy some time, a new method of magnetic recording has been introduced in the last few years which is known as perpendicular magnetic recording, or PMR. Using PMR heads, bits are written perpendicular to the hard disk platter rather than laying them down parallel or horizontally. This method ultimately conserves surface area and effectively increases the storage density without the occurrence of superparamagnetism. However, there is a limit to this method as well.

This is where holographic storage comes in with the ability to store more than a terabyte of data on a single piece of media. Holographic media can be manufactured in various shapes, sizes, and thickness. This non-standard approach is possible because of the way data can be written to it. According to Physorg.com:

Densities in holography are achieved by different factors than magnetic storage. Density depends on the number of pixels/bits in a page of data; the number of pages that are stored in a particular volumetric location; the dynamic range of the recording material; the thickness of the material, and the wavelength of the recording laser.

The first product will most likely be a 300GB disk with a transfer rate of 20MB/sec however the second wave of holographic media will range from 800GB to 1.6TB capacities. Currently, to achieve 1.6TB of capacity we would need 4x400GB hard disk drives in a RAID 0 array which does not come cheap. Pricing on the holographic storage medium has not been announced but since it is a new technology, we can expect prices to be expensive.


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RE: I still am not a huge fan of it
By lemonadesoda on 3/28/2006 6:29:09 PM , Rating: 2
Are you suggesting backing up your server to your USB key disk? Or would you put archive data (e.g. corporate records) to be stored, for say, 10 years, on a flash stick without power?

(remember that non-volatile is a relative term, reflecting the common consumer use of the non-mission critical data, like your digital photos, or your music collection).

The problems with flash are:

1./ Price. Outrageously expensive for data archiving. May be OK for "consumer" pocket devices.
2./ Data retention. Technical issue: the life of an electron charging the "floating gate" has a life of, on average, 10 years. When exactly will bits, bytes, or blocks of your data get lost without auxiliary power (and refresh)? You may be OK for a few months, even years, but at some point (4, 5, 6 years maybe) you will suffer catastrophic failure of the device.
3./ Data endurance. Technical issue: most newer flash parts can survive 100,000 erase or write cycles before errors become very common. While better than earlier devices, just 10,000 cycles, flash is only really practical as a read many, write few medium.


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LETS DO SOME MATH
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1GB flash is approx USD 50. That means a typical server backup of, say, 400GB, would cost you USD 50 x 400 = USD 20,000

A 400GB tape would cost you less than USD 50.

And you say you prefer to use flash! Either you are out of your mind, or obviously one hell of a wealthy guy!


By quickquest88 on 3/28/2006 6:43:27 PM , Rating: 3
And let's not forget that ANY type of magnetic drive will be vulnerable to EMP!! Optical holographic is not, or should not be vulnerable, except to physical destruction.

So a high dollar Flash drive could be killed by a magnetic field.

I can see the bonus for using this for mission-critical units first, then trickle down to us normal users.



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