I loaded two dvd's in the tray... wondering what happened inside

msea4ever

Beta member
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4
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canada
I have an old desktop PC with a vertical loading DVD tray. It was dark and I foolishly loaded a second dvd ontop of a dvd that was already in there. I pressed the button and the computer took them both in.

I soon realized that it wasn't reading anything. I didn't hear any grinding or crunching noises so it seems like the motor just didn't move. The icon did not identify any DVD Title either.

My question is: What happened inside? Did the extra width of 2 dvds (instead of one) jam the motor or did the motor just not start at all?

I'm not sure if anyone will know the answer. But I am curious as to the inner workings.

Would love to hear opinions. The dvd player seems to work fine now... with just one disk in it! But I am concerned I might have worn out the motor a bit by jamming it. :neutral:
 

S0ULphIRE

Golden Master
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9,230
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Australia
The motor would likely not have enough torque to move; for a short time this is fine and indeed exactly what happens when you turn on a stationary motor; extended periods of this could burn out the motor or controller as you've put it in a stall, this causes the current to increase a ton over a normal functioning free spinning motor due to no opposing feedback voltage being generated by the magnets in the motor.

Here's a good post about it https://robotics.stackexchange.com/questions/613/what-is-stall-current-and-free-current-of-motors
And this http://physics.bu.edu/~duffy/sc545_notes04/back_emf.html
 

msea4ever

Beta member
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canada
Thank you for that and the links. It helps me to understand the electricity behind the heat that could burn out a motor.

I was hoping that some rubber wheel or clamp mechanism did not fully engage due to the extra width, and therefore the motor never electrically started.

But I can't know because I can't see what's going on inside the DVD unit. Even if I took the DVD unit out of the PC, I still would not be able to see!

Anyhow it works. And it was only a minute or two of inaction---whatever it was. :silent:
 

msea4ever

Beta member
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canada
It's doubtful it caused any permanent damage. IMO, nothing to worry about.
Thanks. Well, it is just a secondary computer that I picked up from Craigslist. I use it mostly for watching DVDs so I won't burn out the drive on my best computer!

I do not like vertical loading designs. Seems illogical and risky to me. Easy to scratch disks...
 

strollin

Knowitall!
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You could get an external DVD drive and use it instead if you really dislike the vertical design!

I personally wouldn't have worried about the DVD drive on my best computer. A replacement drive is probably less expensive than another entire computer. However, I would have gotten an exterior drive to play movies before I would have purchased a whole 2nd computer from Craigslist.
 
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msea4ever

Beta member
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Location
canada
Ah but this was a deal. 30 bucks Cdn. for a Windows 7 machine that plays video smoothly. That would be about 20-25 bucks your currency! I plan to dual boot with Lubuntu when the greedy Windows barons pull the plug on Win 7 updates. (just kidding). :)
 
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