MY DVD drive does not read all DVDs and also does not burn CDS properly. Often while burning a CD i am prompted that " The machine is unable to caliberate teh required Lazer Power"

Hi i am having a i MAC which has mountain lion OS 10.8.2. I am facing teh followwing issues with my disk drive
1. I am unable to read all DVDS in it some DVDS work while others do not
2. I am able to read all CD's, but while burning a CD i am prompted with the following message
" Unable to caliberate lazer power"
3. Kindly assit me in solving this problem
regards

Hi
Four thoughts
• Brand and type of DVD/CD Media
• Burn Speed ?
• Ever used a Cleaning DVD ?
• Free space on Main Start-Up Hard Disk ?
Brand and type of DVD/CD Media: MATTERS
- Memorex, NoName and other Cheap brands - most probably works for other things BUT NOT FOR VIDEO.
I only use Verbatim
- DVD-RW - usually do not work OK but with various kinds of problems. DVD+R is a more modern sort and use to give problems on older DVD-players
I only use DVD-R
Burn Speed (in iDVD or alike): Matters
• Best or Max - is not best
I set it down to x2 or x4 Max
Ever used a Cleaning DVD ?
I use one WITHOUT Liquid but with brushes from time to time
Free space on Main Start-Up Hard Disk ?
- Due to that Mac OS X - is UNIX - it behaves likewise. It needs lot's of space on Boot / Start-Up Hard Disk for it's and the applications temp files.
I never go less than 25GB free space - If HD-Video material is used then 4-5 times more is a good thing.
Yours Bengt W

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