system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Why is it that discs(CD's and DVD's) need to spin at a very high speed in order for data to be read/written on them ?
gpt
They spin at high speeds in order to get better results. There is a limit to how small the dots can be on a CD or DVD. To get faster data acquisition the disk is spun faster.

Vinyl records used the same principle to a degree. There were 45's, vinyl records with a single recording on each side which spun at 45 rpm. They produced music. LP records were produced to play for longer. They were bigger They spun at 33 and a third rpm. Another format was the 78. It spun faster, 78 rpm in order to have a higher quality sound.

The CD format calls for recording on one side. So the other side is used for a visual label.  LP records stored data on both sides. The label was in the middle of the disk around the hole used to center the record. A blank space had to be left in the middle of each disk because too small a circle could not be used.  All the formats of LP's could be recorded on both sides. Symphonies and Operas were too long to fit on a record. The CD format enabled the recording of longer pieces of music. About twice as much music could be recorded and played on a CD. It seemed perfect at the time. Then we wanted movies which use a lot more data. When DVD's were developed the dots were recorded in layers. The focal plane of the laser was altered to read each layer. Blue Ray uses a different laser, higher frequency, so the dots can be smaller and more data recorded on the same size disk.