{"id":71192,"date":"2019-11-11T17:32:15","date_gmt":"2019-11-11T17:32:15","guid":{"rendered":"https:\/\/\/project-silica-pour-un-stockage-de-donnees-perenne-par-femtos-laser\/"},"modified":"2019-11-11T17:32:15","modified_gmt":"2019-11-11T17:32:15","slug":"project-silica-pour-un-stockage-de-donnees-perenne-par-femtos-laser","status":"publish","type":"post","link":"https:\/\/www.ecinews.fr\/fr\/project-silica-pour-un-stockage-de-donnees-perenne-par-femtos-laser\/","title":{"rendered":"Project Silica pour un stockage de donn\u00e9es p\u00e9renne par femtos laser"},"content":{"rendered":"<p><span class=\"tlid-translation translation\" lang=\"fr\">Des chercheurs des universit\u00e9s de Southampton et de Cambridge travaillant avec Microsoft ont d\u00e9voil\u00e9 <\/span>Project Silica, <span class=\"tlid-translation translation\" lang=\"fr\">un syst\u00e8me de stockage de donn\u00e9es \u00e0 long terme dans un quartz .<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">Les co\u00fbts du stockage \u00e0 long terme sont en constante augmentation de par la n\u00e9cessit\u00e9 de transf\u00e9rer de mani\u00e8re r\u00e9p\u00e9t\u00e9e des donn\u00e9es sur un nouveau support avant que les informations ne soient perdues. Les disques durs peuvent s&rsquo;user apr\u00e8s trois \u00e0 cinq ans. La bande magn\u00e9tique ne peut durer que cinq \u00e0 sept. Les formats de fichiers deviennent obsol\u00e8tes et les mises \u00e0 niveau sont co\u00fbteuses. Des soci\u00e9t\u00e9s cin\u00e9matographiques telles que Warner Bros effectuent une migration proactive des contenus tous les trois ans pour rester en avance sur les probl\u00e8mes de d\u00e9gradation.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">Le stockage des donn\u00e9es dans le quartz pourrait devenir une option moins co\u00fbteuse, car les donn\u00e9es ne sont stock\u00e9es qu&rsquo;une seule fois. Les lasers femtosecondes d\u00e9velopp\u00e9s \u00e0 Southampton pour <\/span>Project Silica <span class=\"tlid-translation translation\" lang=\"fr\">changent la structure du mat\u00e9riau de fa\u00e7on permanente, ce qui permet de conserver le stockage des donn\u00e9es pendant des d\u00e9cennies, voire des si\u00e8cles.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">Le verre de quartz mis au point dans le cadre du <\/span>Project Silica<span class=\"tlid-translation translation\" lang=\"fr\"> n\u2019a pas non plus besoin de la climatisation pour maintenir les mat\u00e9riaux \u00e0 une temp\u00e9rature ou \u00e0 une humidit\u00e9 constante, ce qui r\u00e9duit les co\u00fbts de stockage \u00e0 long terme des donn\u00e9es dans le cloud.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">\u00abNous n&rsquo;essayons pas de construire des choses que vous utilisez chez-vous pour regarder des films. Nous construisons un stockage qui fonctionne \u00e0 l&rsquo;\u00e9chelle du cloud \u00bb, a d\u00e9clar\u00e9 Ant Rowstron, directeur adjoint&nbsp; du laboratoire Microsoft Research Cambridge au Royaume-Uni.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">\u00abL&rsquo;une des choses importantes que nous voulions \u00e9liminer est ce cycle co\u00fbteux de transfert et de r\u00e9\u00e9criture des donn\u00e9es vers la g\u00e9n\u00e9ration suivante. Nous voulons vraiment quelque chose que vous pouvez mettre sur le march\u00e9 pendant 50, 100 ou 1000 ans et l&rsquo;oublier jusqu&rsquo;\u00e0 ce que vous en ayez \u00e0 nouveau besoin \u00bb, a-t-il d\u00e9clar\u00e9.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">Microsoft et Warner Bros. ont copi\u00e9 une version num\u00e9rique de Superman sur le stockage \u00e0 quartz. Les lasers infrarouges encodent les donn\u00e9es en voxels, l&rsquo;\u00e9quivalent tridimensionnel des pixels qui composent une image plate. Contrairement aux autres supports de stockage optiques qui \u00e9crivent des donn\u00e9es \u00e0 la surface, Project Silica stocke les donn\u00e9es dans le verre m\u00eame. Un morceau de verre de 2 mm d&rsquo;\u00e9paisseur peut contenir plus de 100 couches de voxels.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">Les donn\u00e9es sont encod\u00e9es dans chaque voxel en modifiant la force et l&rsquo;orientation des impulsions laser qui d\u00e9forment physiquement le verre. Pour relire les donn\u00e9es, des algorithmes d\u2019apprentissage automatique d\u00e9codent les motifs cr\u00e9\u00e9s lorsqu&rsquo;un faisceau de lumi\u00e8re polaris\u00e9e traverse le verre.<\/span><\/p>\n<p><span class=\"tlid-translation translation\" lang=\"fr\">D\u00e8s le d\u00e9but, l&rsquo;\u00e9quipe de recherche a essay\u00e9 d&rsquo;en cuire un exemplaire dans un four \u00e0 500 \u00b0 C &#8211; d&rsquo;o\u00f9 l&rsquo;utilisation de verre de quartz plut\u00f4t que d&rsquo;une vesion plus fluide &#8211; de le passer au four \u00e0 micro-ondes, le faire bouillir ou le frotter avec de la laine d&rsquo;acier. Quand ils ont relu les donn\u00e9es, tout \u00e9tait toujours l\u00e0!<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.microsoft.com\">www.microsoft.com<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Project Silica a encod\u00e9 une copie num\u00e9rique compl\u00e8te du film &lsquo;Superman&rsquo; sur une simple feuille de quartz pour un stockage \u00e0 long terme des donn\u00e9es.<\/p>\n","protected":false},"author":22,"featured_media":71193,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[883],"tags":[913,905,907],"domains":[47],"ppma_author":[1149],"class_list":["post-71192","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologies","tag-materials-processes-fr","tag-memory-data-storage-fr","tag-optoelectronics-fr","domains-electronique-eci"],"acf":[],"yoast_head":"<title>Project Silica pour un stockage de 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