in burner we seen 16 X something what is X

For CD (Compact Disc) it is 150KB/sec (data), so an 8 X CD-ROM can read data at 8 x 150 KB/sec, or 1200 KB/sec

For CD-Audio it is slightly higher, as the discs use 1/9th to 1/7th of their storage for data for error detection, correction, avoidance, etc. algorithms. CD-Audio is pretty much 'raw', so they can read at an actual 176,400 bytes/sec. (This is also why when you read a CD-Audio disc into a digital format the data will not always be exactly the same each time, as it barely matters if one bit, of one sample is slightly off for an audio stream).

The original CD-Audio spec was for 74 minutes of audio, at 44.1 KHz, 16-bit, Stereo.
For a particular piece of music. Which I'll leave up to you to research on your own.
This makes it is easy to remember the size as: 74 x 60 (seconds per minute) x 44100 (sample rate in Hertz) x 16/8 (for bytes) x 2 (for stereo).
= 783,216,000 bytes (excluding error correcting overheads built into the medium, so lose about ~13% (x 0.87) for ~681,397,920 bytes.

~ = Approximately, as the actual amount used for error detection, correction, avoidance is not exactly 13% of the total medium.


For DVD (Digital Versatile Disc) it is 10.5 Mbits/sec, which equates to 10.5 * 1,000,000 / 8 = or 1281.73828125 KB/sec

So a 1 x DVD-ROM can read about the same speed as an 8 X CD-ROM (which is good, except that they're much larger in capacity).

There's other related issues to the actual performance you get, such as CAV vs CLV, etc. There's a good Wikipedia article covering these.

Whilst video and other multimedia content is often encoded at lower than 10.5Mbps, as video streams need not be a constant bit rate, this is where real 'Video 'Broadcast' Broadband' actually begins. (10.5Mbits/sec to 12Mbps due to networking overheads; which also happen to be roughly 12.5% on some network mediums).

Once everyone has a 10.5Mbps+ Internet connection, and I mean everyone in the sense that it replaces 9600 bps dial-up which you can still find today -even in Western economies- if you look hard enough, the Internet as a whole can move on and we will start witnessing the death of mass produced media. Hollywood always did prefer the rental model as opposed to 'buy to own*'.

FYI: Windows Vista, and later, come with the software side of the technology that will enforce this; and Windows XP support pretty much ends on April 14th 2014. Which is the date Hollywood is eagerly awaiting.

"There will be even more technology announced this coming March/April, in 2014, than usual."
Feel free to quote me on that.