Toady I downloaded a .iso file and wanted to burn it to a CD.  I started K3B as usual and while it was loading (takes a while from gnome), I got out a blank CD and went to insert it in the drive.  I got no response to the open button on the drive and tried a number of things (see below) before opening my system log and finding:
<br><blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">Sep&nbsp; 6 15:36:34 localhost kernel: [ 3049.264141] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
<br>Sep&nbsp; 6 15:36:34 localhost kernel: [ 3049.264154] ata2.00: cmd a0/01:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0xac data 8 in<br>Sep&nbsp; 6 15:36:34 localhost kernel: [ 3049.264156]&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; res 40/00:03:00:00:20/00:00:00:00:00/a0 Emask 0x4 (timeout)
<br>Sep&nbsp; 6 15:36:34 localhost kernel: [ 3049.264188] ata2: soft resetting port<br>Sep&nbsp; 6 15:36:34 localhost kernel: [ 3049.576073] ata2.00: revalidation failed (errno=-2)<br>Sep&nbsp; 6 15:36:34 localhost kernel: [ 3049.576081
] ata2: failed to recover some devices, retrying in 5 secs<br>Sep&nbsp; 6 15:36:39 localhost kernel: [ 3054.577527] ata2: soft resetting port<br>Sep&nbsp; 6 15:36:40 localhost kernel: [ 3054.889468] ata2.00: revalidation failed (errno=-2)
<br>Sep&nbsp; 6 15:36:40 localhost kernel: [ 3054.889477] ata2: failed to recover some devices, retrying in 5 secs<br>Sep&nbsp; 6 15:36:45 localhost kernel: [ 3059.890912] ata2: soft resetting port<br>Sep&nbsp; 6 15:36:45 localhost kernel: [ 
3060.202866] ata2.00: revalidation failed (errno=-2)<br>Sep&nbsp; 6 15:36:45 localhost kernel: [ 3060.202876] ata2.00: disabled<br>Sep&nbsp; 6 15:36:46 localhost kernel: [ 3060.706515] ata2: EH complete</blockquote><div><br>Just for grins I rebooted the system and then everything was fine.&nbsp; Anyone have a clue what actually went wrong here?&nbsp; I mean maybe it had to do with me trying to open the drive at the wrong time during K3b startup (as I often do).&nbsp; I just do not know.
<br><br>BTW, the other things I tried included more open drawer button presses and using the $30 tool (a paper clip) to open the drawer, close it, open it, inserted a blank, closed the drawer and when the system never saw the CD and the drawer open drawer never did work&nbsp; I realize this makes sense if the kernel had disabled the drive but wanted to describe them in case anyone wanted to suggest trying such things 
<br></div><br><br>-- <br>The nice part about being a pessimist is that you are constantly being either proven right or pleasantly surprised.<br>&nbsp;&nbsp;- George F. Will