What is the standard rotation speed (1x) of a DVD player motor?

Answer 1

Interesting question.
You are not asking the rotation speed of the DISK but of the MOTOR.
This is an important difference.

Quote ***

" DVD-R, like CD-R, uses a constant linear velocity rotation technique to maximize the storage density on the disc surface.
This results in a variable number of revolutions per minute (RPM) as disc writing/reading progresses from one end to the other.
Recording begins at the inner radius and ends at the outer. At "1X" speeds, rotation of the disc varies from 1,623 to 632 RPM on 3.95 Gbyte media and ...
1,475 to 575 RPM on 4.7 Gbyte media, depending on the record/playback head’s position over the surface. "

http://www.amigoshare.com/ref/dvd_video.html

Unquote ***

In order to find out the speed of the MOTOR we would have to measure the distance from the motor's spindle to the start of the writable area on the DVD disk and use the ratio of RPM increase calculated from the inner to outer radius with the data provided above to discover the motor's RPM.

In all modesty I am way out of my league here ( a visitor from the computer & Internet category) so I cannot readily do that calculation for you.....but a little research in fundamental physics formulas will provide the proper method of calculation.

regards,
Philip T

Answer 2

*Max. rotating speed 1x CLV (rpm), 1515, 1667. Min. rotating speed 1x CLV (rpm)
*The pits are stamped into a single spiral track (per layer) with a spacing of 0.74 microns between turns, corresponding to a track density of 1,351 turns per millimeter or 34,324 turns per inch. This equates to a total of 49,324 turns and a total track length of 11.8km or 7.35 miles in length. The track is comprised of sectors, with each sector containing 2,048 bytes of data. The disc is divided into four main areas:

*The center hole in a DVD is 15mm in diameter, so it has a radius of 7.5mm from the center of the disc. From the edge of the center hole to a point at a radius of 16.5mm is the hub clamp area. The lead-in zone starts at a radius of 22mm from the center of the disc. The data zone starts at a radius of 24mm from the center and is followed by the lead-out (or middle) zone at 58mm. The disc track officially ends at 58.5mm, which is followed by a 1.5mm blank area to the edge of the disc.

Officially, the spiral track of a standard DVD starts with the lead-in zone and ends at the finish of the lead-out zone. This single spiral track is about 11.84 kilometers or 7.35 miles long. An interesting fact is that in a 20x CAV drive, when reading the outer part of the track, the data moves at an actual speed of 156 miles per hour (251km/h) past the laser. What is more amazing is that even when the data is traveling at that speed, the laser pickup can accurately read bits (pit/land transitions) spaced as little as only 0.4 microns or 15.75 millionths of an inch apart!
DVDs come in both single- and dual-layer as well as single- and double-sided versions. The double-sided discs are essentially the same as two single-sided discs glued together back to back, but subtle differences do exist between the single- and dual-layer discs. The table below shows some of the basic information about DVD technology, including single- and dual-layer DVDs. The dual-layer versions are recorded with slightly longer pits, resulting in slightly less information being stored in each layer.

*

Answer 3

2620 rpm to 1089 rpm is dvd disk spin @ 1x >> 6.61 m/s
the rotational speed of an HD DVD-ROM/R/RW disc decreases from roughly (ID to OD) to maintain a constant linear velocity of 6.61 m/s

http://www.emedialive.com/Articles/ReadArticle.aspx?ArticleID=11632
____________

i did find another interesting site,
http://www.osta.org/technology/dvdqa/dvdqa4.htm

but my own understanding still remains foggy

hope to clear some fog out, but sure needs more time for a thick-head as me

constant linear velocity & constant angular velocity
> both are tricky in their own different ways
... how exactly it is done in this application is still unclear to me

use plc's & drives, with feedback & closed loops > fine
but in a 2 pence device ???

lemme get started & see if i really find anything

Answer 4

Look up Google.