I am using acer aspire 4730z, windows 7 32 bit
cd drive is not working all of the sudden its stop working
how to solve it can you people help me
This is where I pull out my 20 dollar USB DVDRW and use that instead. Your post is tantamount to "it's broken" with no detail.
If you have shared more like "Device manager shows Code 39" or such I would have other ideas. But you didn't tell much.
If it works, it was a system software glitch or dirt on the read/write head. If not, get a replacement drive.