I've been experimenting trying to understand what is wrong with my DVD
writer tray eject mechanism. After installing a software that would
automate trying to eject 5 times before it quits trying, I was able to
'calculate' that it sometimes took 10-20 consecutive tries until/but it
would finally open. Then after further determining that it didn't
matter whether windows or some other OS or no OS other than BIOS was in
control, the problem was the same, I made another discovery. If there
were a CD in the tray, it would open every time under the same
conditions that previously required 20 tries to open.

Then I started searching on terms related to that behavior and found
that there were a number of webforums where this same problem was
described and remedied, particularly with my type/brand/model of drive.

The basic problem is that there is a plastic puck containing a magnet
over the disk spindle which is used to hold/secure the CD on the
spindle. When ejecting, it is necessary that the tray ejection
mechanisms overcome any attraction between the magnet and the spindle,
which attraction is apparently stronger when there is no disk under the
magnet. The two types of fixes consisted of either disassembling the
over part of the magnet/puck container and adding a 'diffusion' layer of
space under the magnet or by disassembling the under part and tweaking
the mechanics of the tray ejection pully/belt/wheels to improve the tray
ejection force.

Personally I'm currently solving the problem by keeping a disk in the
tray instead of fixing it.

I never knew before there was a strong magnet to hold the disk
down/steady, and apparently there are other important magnets in CD
drives as well. Magnets are used in the motor to spin the drive, in the
lens tracking process, and in the relay switches.


--
Mike Easter

In article <(E-Mail Removed)>, Mike Easter <(E-Mail Removed)> wrote:
>I've been experimenting trying to understand what is wrong with my DVD
>writer tray eject mechanism. After installing a software that would
>automate trying to eject 5 times before it quits trying, I was able to
>'calculate' that it sometimes took 10-20 consecutive tries until/but it
>would finally open. Then after further determining that it didn't
>matter whether windows or some other OS or no OS other than BIOS was in
>control, the problem was the same, I made another discovery. If there
>were a CD in the tray, it would open every time under the same
>conditions that previously required 20 tries to open.
>
>Then I started searching on terms related to that behavior and found
>that there were a number of webforums where this same problem was
>described and remedied, particularly with my type/brand/model of drive.
>
>The basic problem is that there is a plastic puck containing a magnet
>over the disk spindle which is used to hold/secure the CD on the
>spindle. When ejecting, it is necessary that the tray ejection
>mechanisms overcome any attraction between the magnet and the spindle,
>which attraction is apparently stronger when there is no disk under the
>magnet. The two types of fixes consisted of either disassembling the
>over part of the magnet/puck container and adding a 'diffusion' layer of
>space under the magnet or by disassembling the under part and tweaking
>the mechanics of the tray ejection pully/belt/wheels to improve the tray
>ejection force.
>
>Personally I'm currently solving the problem by keeping a disk in the
>tray instead of fixing it.
>
>I never knew before there was a strong magnet to hold the disk
>down/steady, and apparently there are other important magnets in CD
>drives as well. Magnets are used in the motor to spin the drive, in the
>lens tracking process, and in the relay switches.
>
>
As cheap as CD or DVD recorders are today, I wouldnt even waste the hours of
time you are spending on this. get a new one.

GMAN wrote:
> Mike Easter
>> I've been experimenting trying to understand what is wrong with my DVD
>> writer tray eject mechanism.

> As cheap as CD or DVD recorders are today, I wouldnt even waste the hours of
> time you are spending on this. get a new one.

In the beginning, I didn't realize it was an engineering/design flaw
problem.


--
Mike Easter