[ubuntu] dvd drive issues

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http://ubuntuforums.org – I got a used dvd drive (optiarc dvd rw ad-7220A) and it seemed to work OK, so I burned a bunch of data and also some iso images. K3b showed successful burns. Everything seemed to be working, so I deleted some important files I believed to be backed up (was very low on hard drive space) Now, the drive is acting up: won't read dvds I burned, and when I press eject button on drive, it opens and immediately recloses (I have a disc in right now... it won't let me get it out) also, the dvd with iso image burned won't play in home dvd player (used devede to create iso... never had problems before) I (Hardware)