i try erasing cd,
From this I guess you are using re-writeable CDs. ALL stereos I have experienced is NOT able to read CDRWs only CDRs. This has something to do with the bandwidth of the laser used for reading.
Regarding the 'wont eject issue', this I have experienced before. I think it has something to do with the drive operating autonomously under a single 'disk erase' command and the OS cannot abort that operation once issued. Further, the drive wont let you eject the disc until the current operation is completed.