How Does a DVD Player Remember Where a DVD Stops?

Hey nice question...

I have no idea...but if I was designing it, I'd merely keep the last location in non-volatile memory ready to be recalled next time.

Dunno how the locations are worked..tracks and sectors?

Del

hello del the cat and sparkstation,

Thank you for your answers. I appreciate your time on helping me with this. Now at least I have an idea on how it works...i can sleep soundly once more =P

You're very Guest.

Would you like to Register at CR4 ?

It is really easy,and always helpful folks just a'waiting to assist.

Remember it is only the truly ignorant who do not enquire about things, or ask questions, that way they never, ever learn, preferring to remain in the corner wearing a pointy hat

Kind Regards....

hi sparkstation,

I've heeded your advice. Although I doubt I will be much of a contributor with my limited knowledge. But thanks anyway!

Good for you, gelearn,

Knowledge arrives in building blocks of information,or a ladder.

We all start at the bottom of the ladder, just a shame some folks never actually try to climb the ladder of knowledge.

As your Store of Knowledge increases, it becomes more and more easy to learn more, and it becomes faster to learn.

Looking forward to seeing more of you, in the days, weeks, months ahead, and here's a new hat for you.

Kind Regards.....

Hi Spark station,

Your words are quite encouraging. Many don't come out with their views / qurries thinking only they in the world not much aware of things. As u rightly said knowledge is accumulation of information. Keep inspiring folks....

Thanks mate, nice answer.

Thanks Sparkstation.

I also responded to Del The Cat and talked about your very informative answer. I always wanted to find out but was afraid to ask. I had given him my layman's explanation how it works as I thought.

Thanks for broadening my horizon.

Regards;

Nadeem

12072007

Huh! And here all this time, I had thought it was the hamster that runs around making it turn that remembered where to start it up again... Ya learn somthing new every day, if ya pays close enuff attention! Thanks!!!

Very well explained! I think it's safe to say that most of us have wondered "how they do that"...thanks for a simple and informative description of the process.

Yeh..if only someone could explain how to remember where I parked my car

The DVD or CD is all digital data and as such it has an address just like the HDD in your computer.

As for finding cars I bought a bright yellow one. The kids call it the "duck." You can always find it in the car park.

Counting the "pits" on the CD could be feasable, but not ideal...

How would you insert a CD/DVD into the player and jump to track5?

The player would have to first count the amount of pits on the player, and work out where track 5 was located, imagine how long it would take to "index" each CD/DVD you have?

Nah, a easier aproach is to write a "TOC" or Table of Contents, this gives the track layout of the CD, the track order, the location of each track on the disk, the length of each track, total playing time, and on some CD's the names of each track similar to MP3's ID3 format..

Check out "Blue Book" on Wiki -> http://en.wikipedia.org/wiki/Blue_Book_specification

and there are other "Books" dealing with other formats..

• Red Book (CD Digital Audio)
• Yellow Book (CD-ROM and CD-ROM XA)
• Orange Book (CD standard) (CD-R and CD-RW)
• White Book (Video CD)
• Blue Book (Enhanced CD, CD+G and CD-Plus)
• Beige Book (Photo CD)
• Green Book (CD-i standard) (CD-i)
• Purple Book (DDCD)
• Scarlet Book (Super Audio CD)

I did have a bound copy of the orange book once .... dunno why I had it tho.