The disk you inserted was not readable By this computer (Error)

Hi
everytime in the last couple of days im inserting a bank Cd to my cd/dvd drive (MATSHITADVD-R UJ-85J) im getting the same error
"the disk you inserted was not readable By this computer"
it only happen when the disk is blank. all other disks work ok.
haven't install any new software or hardware, but had some HDD problems.
any suggestion what should i do?
my system profile is:
version 10.5.7
Hardware Overview:
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.20f4
Serial Number (system): W873226** <Edited by Host>

first time posting so not sure this ended up in correct area...
I had same issue except only repairing the permissions didn't solve anything for me. *_If you recently upgraded your iTunes to 8.2_* check your permissions for errors, fix the errors, then restart computer and if that doesn't fix it, then try one of the 3 solutions below as there is a *known burn issue with the recent 8.2 update!*
My permission errors - permissions differ on ./Applications/iTunes.app/contents... etc, should be -rw-rw-r--, they are -rwxrwxr-x
I called Apple Care and we figured out 3 work arounds til a fix is released.
Solutions 1,2 are recommended by Apple Care. I used solutions 1 (easy) and then 3 (complicated).
Option 3 is a pain and takes A LOT of time and HD space or external HD if you have tons of music, podcasts, audiobooks, etc, loaded into your iTunes.
_*3 possible solutions:*_
1. Use the Finder window already built in the mac (to burn onto blank cds) -
Open Finder Window, go to File in the Menu Bar at top of computer, create a new Burn Folder, drag items to the folder and click on the burn icon inside the folder, insert blank disk when asked, add name, select burn speed, burn the cd.
2. Use the app Burn 2.3U -
Found at Apple.com in download section works like a Finder Window and converts audo files to MP3 automatically. (You can set up iTunes to do this as well)
3. Install an older version of iTunes 8.0.2 (couldn't find 8.1 thru 8.1.051) -
I found 8.0.2 at Apple.com, this process is complicated and you will need lots of HD space or external HD to do this because you'll want to back up your music library and you will need to delete version 8.2 BEFORE trying to install an older version. Otherwise stick with option 1 or 2 til a fix is released by Apple.
I ruined 8 blank cd's that actually burned but then I got the error message "the disk you inserted was not readable by this computer (Error)" at end of burn cycle and sometimes early disk ejections. _*I had no problems before the iTunes update in the past 5 days.*_ Still can't read/play the 8 disks but the problem went away!
I had burned 20 cds no problem last week with same media disks that were producing errors after doing the iTunes update, now after chosing to downgrade my iTunes I'm back to burning with no issues!
8.2 has 2 versions 32bit or 64bit, one of them may be PC/Windows version only but not sure which one I upgraded to or if that's even a factor with the permission errors I had.
Best wishes

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