Many are different.
Most use separate holders for cds and switch them ,in and out, above the rear of the unit were the laser is located.
I have one for the computer and I'm afraid to take it apart to see how it works.
car cd changers are normally mounted in either the trunk or the glove compartment
Most CD changers are very durable, and handle very well even on rough, bumpy roads.
Pioneer is the leader in CD changers, and all their products are very well regarded.
You can find aftermarket CD Changers that fit your car at http://www.crutchfield.com . Their fit selector will help you determine what CD changers/kits will fit. Another reputable site is http://www.sonicelectronix.com .
Car CD changers will often come with installation instructions if it is purchased new. If the CD changer is already installed in the car, there probably will not be instructions.
yes
I like Pioneer much better myself.
Yes, there are universal cd changers sold
The largest home cd changers can handle 100 cds.The largest Car Changers only handle a dozen usually.
Yes the CDP-CX355 mega 300 does.
Typical changers carry around 6 to 12 cds.
Sony and Pioneer are the top selling brands for cd changers.