I have an iMac running 10.7.5 and I am experiencing problems importing and burning CD's. I suspect it may be a hardware problem as it afflicts tracks in a certain position on the disc I believe.

Importing misses parts of a track and exporting gives a corrupted track that will not replay. I have cleaned the lens on the drive and tried various different speeds for import and export.

Hello Mister Bling,
Thank you for providing all the information about what is going on with your burning issue you are experiencing.
I recommend resetting the System Management Controller (SMC) on your iMac:
Resetting the SMC for Mac Pro, Intel-based iMac, Intel-based Mac mini, or Intel-based Xserve
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
You can find the full article here:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
If you are still having trouble with burning and importing after that step, you may need to have your optical drive looked at:
The drive scratches media
If media is getting scratched after being used in the drive please contact Apple, contact an Apple Authorized Service Provider, or make an appointment with an Apple Retail Store for additional troubleshooting, evaluation, or service.
You can find the full article here:
Apple Computers: Troubleshooting the slot-loading SuperDrive
http://support.apple.com/kb/HT2801
Thank you for posting in the Apple Support Communities. 
Best,
Sheila M.

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