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Professional Disc for DATA gives more <br />storage capacity, performance and reliability <br />from Day One... and better still it's built to <br />keep pace with fast-growing business <br />storage needs for years to come_ Current <br />drives and media will offer backward <br />compatibility with the next generation of <br />Professional Disc for DATA products that will <br />boost performance to 50 GB storage <br />capacities with a transfer rate of 22 MB/s. <br />rutur, genes rht n !,,v,_-, and media will <br />r rtt nd these rsfa abilities further still. offering <br />100 GB storage capacities with a read data <br />transfer rate of 43 MB/s by 2007. <br />Professional Disc toy DATA uses <br />latest Sony phase change <br />recording technologies to store <br />data with a higher density, <br />reliability and transfer speeds <br />than other optical formats. By <br />reducing the wavelength at <br />laser light frorn red to blue/ <br />violet with a wavelength of just <br />405 nm, the narrower beam <br />spot enables higher recording <br />densities some 2-6 times that of <br />the red laser technology used <br />for conventional optical media. <br />Moreover, the powerful <br />objective lens used for focusing <br />the laser beam has a numerical <br />aperture of 0 85 greater than <br />that used for DVDs I[1A: 0 ni <br />l d MO discs (NA <br />Future Roadmap <br />5OGB <br />22MB/s <br />., 23GB <br />11MB/s <br />4 14� <br />t1 <br />0.575) - narrowing the beam <br />further and doubling recording <br />density. The resulting track <br />pitch of just 0.32 pm makes it <br />possible to record 23 GB on <br />one side of a disc - far higher <br />than CD, DVD and other optical <br />storage formats. <br />The overall thickness of the 120 <br />mm disc is 1.2 mm, the same <br />as that of a DVD disc. However, <br />the recording layer has a cover <br />layer of just 0.1 mm thickness <br />that Increases the margin of <br />error when the disc tilts or <br />bends. improving tilt tolerance <br />compared with convenlion;d <br />oplical discs and enhancing <br />rel utility of read mite operafions. <br />CD <br />A =780 nm <br />NA -0 45 <br />1 2mm cover leyet <br />650MB <br />1000B <br />43MB/s <br />DVD <br />A =650 n m <br />NA=0.6 <br />0.6mm cover layer <br />—4— <br />Blue Laser <br />A =405 nm <br />NA -0 85 <br />0.1mm cover layer <br />23GB <br />sony developed Blue Laser phase change recording tech oology enables <br />higher density re anrdiag densities coin pxed with ohc ptical formai s. <br />