{"id":2697,"date":"2020-02-19T17:48:15","date_gmt":"2020-02-19T16:48:15","guid":{"rendered":"https:\/\/www.historicalcollections.deib.polimi.it\/?page_id=2697"},"modified":"2020-11-20T07:15:25","modified_gmt":"2020-11-20T06:15:25","slug":"dischi-floppy","status":"publish","type":"page","link":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/collezioni\/informatica-collezioni\/dischi-floppy\/","title":{"rendered":"FLOPPY DISKS"},"content":{"rendered":"
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3.5\u2033 1.44 Mb<\/h3>\n

The 3.5-inch floppy disks (about 90 mm side), also known as \"micro floppy disks\", also familiarly called \"microfloppy\", were the result of a further evolution of the original 8-inch floppy disks, invented and initially released by Shugart and Wang Laboratories. Despite the name and unlike the 8 and 5.25 inch floppy disks, they had a hard shell rather than a flexible one. In addition, the magnetizable disc had been equipped, instead of the central hole, with a metal pin to facilitate traction. A metal spring cover was also introduced to protect, when not inserted in the drive, the uncovered area of \u200b\u200bthe protection (previously this area was always exposed, forcing users to keep the disc in special covers when not in use). Finally, to prevent the drive from writing operations, a mechanism was inserted to discover, when necessary, the appropriate signaling hole (previously the hole had to be covered with adhesive tape, and the message sent to the drive was reversed: hole covered indicated forbidden writing, while open hole allowed writing).<\/p>\n<\/span>INSIGHTS<\/a>\n

5\u2033 \u00bc 1.6 Mb<\/h3>\n

5.25-inch floppy disks (over 13 cm per side), also called \"mini floppy disks\", also known as \"minifloppy\", are the result of an evolution of the original 8-inch floppy disks, invented and spread initially by Shugart and Wang Laboratories.<\/p>\n<\/span>INSIGHTS<\/a>\n

8\u2033 1.2 Mb<\/h3>\n

I floppy disk nacquero nel 1967 quando l\u2019ingegnere fisico Alan Shugart, che nell\u2019IBM ricopriva il ruolo di Direct Access Storage Product Manager, mise a punto un sistema semplice e poco costoso per caricare microcodice sui suoi mainframe System\/370. Il risultato fu un disco di sola lettura, di 8 pollici (20 cm) di diametro, chiamato \u201cmemory disk\u201d. La prima commercializzazione \u00e8 avvenuta nel 1971.<\/p>\n<\/span>INSIGHTS<\/a><\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":14,"featured_media":0,"parent":631,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"pro\/page-templates\/full-width-page.php","meta":{"footnotes":""},"class_list":["post-2697","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/pages\/2697","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/comments?post=2697"}],"version-history":[{"count":9,"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/pages\/2697\/revisions"}],"predecessor-version":[{"id":3615,"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/pages\/2697\/revisions\/3615"}],"up":[{"embeddable":true,"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/pages\/631"}],"wp:attachment":[{"href":"https:\/\/www.historicalcollections.deib.polimi.it\/en\/wp-json\/wp\/v2\/media?parent=2697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}