Disk and more disks

I found this information in one magazine AeroMexico September giving free or courtesy, this article talk about different types of discs.

Vinyl and Musical

Emile berliner came up with the idea of storing sound on vinyl disk,or what would come to be called "records", in 1887.His method took the place of the original recordered cylinders on Thomas Alva Edison's invention , the phonograph .At the outset,these vinyl disks, spinning at 78 RPMS (REVOLUCIONES POR MINUTO),were recorded on only one side , but by 1923 , recordings on both sides had become standard . Later , along came the 45 RPM record ,capable of holding the same amount of music but on a smaller disk. The 45 went on to capture the lion's share of the market in the 1960 's , when rock music became all the rage.

For Throwing

One flat round obkect, used in one of the most ancient of athletic competitions ,has retained the original Latin root: the "discus" throw.Men compete with a disk weighing two kilograms and measuring 220 mm in diameter , while female athletes loft one weighing one kilogram and measuring 181 mm . The world famous 5th-century B.C. sculpture Discobolus (The Discus Thrower), by Myron , attests to the Olympic event's longevity.

The compact Variety

Known the world over by its English initials ,Dutchman Joop Sinjou ans Toshi Tada Doi from Japan invented the CD in 1979 . The first CD's were used for marketing classical music,and it took a few years before they were affordable and popular enough to became the preferred format for all recorded music.By 1984, the CD's capacity to store 700 MB of data had also made it an integral part of the computer world.

Hard Ones

The hard disk(also known as hard drive)is where a computer's permanent information gets stored.The first one,the IBM 350 , made its appearance in 1955 , in conjuction with the IBM 305 computer .These days ,they can even be external or portable , coming in all sorts of sizes and storage capacities.

Inter-Vertebral

This gelatinous anatomical structure lies between the vertebrae , giving them the flexibility to twist and bend ,while also cushioning the spinal cord.Some maladies ,such as degenerative disk disease ,can deteriorate them , leading to the nervous system being affected .Modern medicine has devised surgical procedures to replace defective disks with artificial ones or human transplants.

Disco Music

The genre mixes pop sensibility with funk ,R&B, soul and a sprinkling of Latino rhythms into catchy dance music.From 1976-1979,"discotheques",otherwise known as - what else?-"discos", sprang up all over to accommodate the fevered crowds.By 1985, the phenomenon had largely subsided, though it experienced a revival in the 90s.