My DVR-112D can't read CD-s, but no problem with DVD-s

Try running a firmware update. You can get the firmware at the following link: http://www.pioneer.eu/eur/support/software/DVR-112DSV/index.html#download_103

If you have not ran your windows updates yet you might try to do that. Alot of issues like these were fixed with service pack 2 for windows XP. Hope this able to help you.

This unit has alot of issue with CD reading and writing probably its a problem with the lens of this player, so since its still new better take it to the store and have it replace..

Hope that helps........

Boris
Is this drive a new addition or have you had it and this just started?
Have you changed your OS?
Make sure you have all of the service packs for your OS.
If you have 2 optical drives try setting this 1 as slave and the other as master.
Update your firmware to the latest version at this link.The 112 series is about half way down.
Bob
http://pioneer.jp/device_e/product-e/ibs/device_e/dev00001r_e.html#firmware1

So the driver is either 'malfunctioning' or it's broken...do you know what revision firmware the drive is using? Your disk authoring software may tell you this. The latest version is 1.22 which you can get by Googling PIONEER DVD-RW DVR-112D firmware. Or go to the Pioneer website. I do not know how to upgrade the firmware for the recorder in MAC Land, in PC Land the firmware update is a simple executable file.

If you are running this version you can try to reflash it. Have you tried another brand of DVD disc? Some discs are less compatible than others. Try another brand of DVD

http://www.pioneerelectronics.com/pio/pe/images/portal/cit_3424/426554181POV_DVR-112D.pdf

hi. if you will go to...
http://wwwbsc.pioneer.co.jp/product-e/ibs/device_e/dev00001r_e.html
scroll down the page to dvr 112 series firmware the last download for that section should be your driver.
hope this solves your problem. let us know.

you probably need to reinstall the drivers for it.  what operating system are you running?

for most versions of windows, the first thing to try is to go to control panel, and then run the add new hardware wizard.

if that doesn't work, you may need to install drivers or firmware for the Pioneer Burner:

this link should have what you need, if you want to try updating the drivers or firmware:

http://wwwbsc.pioneer.co.jp/product-e/ibs/device_e/dev00001r_e.html

updated firmware will not help. this is a known issue with Pioneer DVR-112D, drive needs to be replaced. Contact Pioneer for a free replacement, here is the url http://www.pioneerelectronics.com/PUSA/Support/Important%3A+Notice+Regarding+CD+Read+and+Write+Functionality+in+Certain+Pioneer+Computer+Drive+Models

The issue occurs only under limited environmental and use conditions that are not typical for most end users, so Pioneer anticipates that most users will not be affected. If you are not experiencing any issues currently, there is no need to take immediate action. The service issue does not pose any health or safety risk.
Pioneer is aware of a potential issue with the above drives’ CD (not DVD) read/write capability. Under certain environmental and heavy use conditions, the above drives may become unable to read or write to CDs. To address this issue, for any of the above model drives that become unable to read and/or write to CDs, Pioneer will provide a replacement unit (which may be a newer model number) at no extra charge, shipping prepaid, subject to the terms and conditions of Pioneer’s standard limited warranty(excluding duration).
Again, we anticipate that most drives will not be affected. However, if your DVR-1810, DVR-2810, DVR-X122, DVR-112D, DVR-112DBK, or DVR-112DSV drive becomes unable to read or write to CDs, please contact Pioneer Customer Service by one of the following methods:
Complete an online replacement request form and submit it online. Once your model and serial number are validated, you will print out the completed form to mail along with the affected drive.
This online form is for United States customers only. For Canadian residents, please contact Pioneer Electronics of Canada customer service directly at 877-283-5901.

You probably require an AC3 filter (surround sound driver), check HERE for a free one.

have you tried cleaning the lens? i also had this experience with my dvd rom and what i did, was cleaned the lens.

tell us what happen after you clean it ok.

update the drivers once and check again ...