quick (but maybe difficult) question

Discussion in 'DVD Video' started by kingrundzap@hotmail.com, Sep 2, 2006.

  1. Guest

    I've got a Sony DVD RW DW-U12A in a Sony Vaio computer that's a couple
    years old. I know the common answer to the problem I'm having is that
    the drive is going--it won't read any CDs any longer, and it's
    increasingly not reading DVDs. PowerDVD gives me the good old "A disc
    with an unsupported format" message in those cases. I'm only trying to

    read commercial prerecorded discs, by the way--not burned discs. I do
    have AnyDVD and CloneDVD on my computer, though. And even when those
    read discs sometimes, they can't analyze the whole disc--they get to
    about 80% or so and CloneDVD locks up. I've tried disabling and even
    uninstalling both AnyDVD and CloneDVD to see if they're causing the
    problem (because of some other copy protection on the commercial discs,

    maybe), but I have the same problems then.

    Here's my question. Why, if the drive is going bad, can it read a lot
    of discs just fine, but not others, and it's consistent on which discs
    it can read and which discs it has trouble with? It must be something
    about the way the information is encoded on certain discs combined with

    whatever is going wrong, I'm assuming, but what?


    Partially, I'm just trying to make sure that the drive is going bad and

    that it's not some other problem. I don't want to (and can't really
    afford to) spend over $100 for a new drive and it doesn't solve the
    problem.


    Thanks in advance
     
    , Sep 2, 2006
    #1
    1. Advertising

  2. JoeBloe Guest

    On 2 Sep 2006 08:57:48 -0700, Gave us:

    >I've got a Sony DVD RW DW-U12A in a Sony Vaio computer that's a couple
    >years old. I know the common answer to the problem I'm having is that
    >the drive is going--it won't read any CDs any longer, and it's
    >increasingly not reading DVDs. PowerDVD gives me the good old "A disc
    >with an unsupported format" message in those cases. I'm only trying to


    The laser head is out of calibration or dusted.

    I'd be willing to bet that it will read just fine upside down.

    The heads sag after a time on their support springs.
    >
    >read commercial prerecorded discs, by the way--not burned discs. I do
    >have AnyDVD and CloneDVD on my computer, though. And even when those
    >read discs sometimes, they can't analyze the whole disc--they get to
    >about 80% or so and CloneDVD locks up. I've tried disabling and even
    >uninstalling both AnyDVD and CloneDVD to see if they're causing the
    >problem (because of some other copy protection on the commercial discs,
    >
    >maybe), but I have the same problems then.
    >
    >Here's my question. Why, if the drive is going bad, can it read a lot
    >of discs just fine, but not others,


    The speed at which a burned disc is recorded can affect it's
    "contrast ratio". same number of bits laid down with a non differing
    laser power will produce this. Older writers didn't vary power so as
    write speeds increased, contrast ratio decreases. In other words, the
    pits get laid down by impinging less on the polymer layer, producing a
    more shallow pit, making the difference between a pit and land less
    "apparent". Also, a DVD is read with a different "head" than the CDs
    are, even in the same reader.

    So, it is either a sagging head and turning it upside down will show
    this or it is that you are reading discs that were burned too fast.

    Also, as a burned disc gets older, the pits "burned" in it "relax"
    rendering it unreadable.

    Could be any of those three or combinations thereof.


    and it's consistent on which discs
    >it can read and which discs it has trouble with? It must be something
    >about the way the information is encoded on certain discs combined with
    >
    >whatever is going wrong, I'm assuming, but what?
    >
    >
    >Partially, I'm just trying to make sure that the drive is going bad and
    >
    >that it's not some other problem. I don't want to (and can't really
    >afford to) spend over $100 for a new drive and it doesn't solve the
    >problem.
    >
    >
    >Thanks in advance
     
    JoeBloe, Sep 2, 2006
    #2
    1. Advertising

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.
Similar Threads
  1. A. Yarrington
    Replies:
    1
    Views:
    425
    Walter Roberson
    Dec 2, 2003
  2. Old Gringo

    Of Intrest ? Maybe Yes, Maybe No

    Old Gringo, Oct 11, 2004, in forum: Computer Support
    Replies:
    0
    Views:
    566
    Old Gringo
    Oct 11, 2004
  3. Jonathan Wilson

    maybe not a good question, but possibly a thought provoking one!

    Jonathan Wilson, Jun 4, 2004, in forum: Digital Photography
    Replies:
    13
    Views:
    1,181
    Journalist-North
    Jun 10, 2004
  4. ~misfit~

    Quick question, hopefully quick answer.

    ~misfit~, Dec 28, 2004, in forum: NZ Computing
    Replies:
    114
    Views:
    2,429
    Troglodyte
    Jan 6, 2005
  5. iL_weReo

    Maybe it will; maybe it won't

    iL_weReo, Oct 11, 2009, in forum: Computer Support
    Replies:
    7
    Views:
    515
    Desk Rabbit
    Oct 13, 2009
Loading...

Share This Page