dvd not recognizing cds

i have an hp machine, windows 7, the model of the dvd-ram SW820 sata cdrom device. it will not recognize the contents and wants to write onto it. other machines can see the contents.

what can I look for?
ttrbrtsnAsked:
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Scott CSenior EngineerCommented:
You probably need a new optical drive.  If I remember correctly there are two different mechanisms that each read DVD and CDs.

One can go bad or become fouled and the other one is fine.

You can try blowing out the drive with some canned air.  

If that doesn't work, I just get a new drive.  A DVD/CD drive is inexpensive.

http://www.newegg.com/CD-DVD-Burners/SubCategory/ID-5

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David Johnson, CD, MVPOwnerCommented:
no points: yes there are 2 different led's one for DVD and one for CD.. as noted above replace the drive
Scott CSenior EngineerCommented:
@David...thanks for confirming.
rindiCommented:
What exactly is the problem? Does it just happen with CD's, or also DVD's? If only with one and not the other, then the above is correct, there are different optics and lasers for DVD's and CD's, as they use different wavelengths.

If you can't read either DVD's or CD's, then it can still be the optics/lasers/other hardware, but then also other issues could be causing this.

The first thing to do is to try booting the PC using a bootable DVD, and also a bootable CD. If that works with both, then the drive is OK and you have a problem with the OS or some utility installed.

So if you have verified the drive is OK, remove any packet writing software from the system. Many commercial CD/DVD writing software like nero etc include such packet writing crap, which is absolutely unnecessary and almost always causes issues.

Once you have removed those things and rebooted, follow the instructions from the link below to delete the upper and lower filters, reboot, and try reading the CD's again:

http://pcsupport.about.com/od/driverssupport/ht/upperfilters-lowerfilters.htm
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