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first, I know nothing about MACS, but assume drivers and firmware are the same when it comes to install or updates. Depending on the burner you are currently utilizing and it's age, you may need to update the firmware. I know when windows depolys patches, hotfixes and or service packs they sometimes f with drivers and firmware. However, again I don't know anything about MACS, so the OS info may be null and void.
Now for the remaining issues. Software being utilized is not an issue. Software doesn't go bad. Memorex, maxell, and sony are no-nos. Most DVD's are foil as opposed to a gas under the plastic. I don't know particularly which are which, but I do know the aforementioned tend to be very cheesy and break down over time. You could try cleaning your discs with isopropyl alcohol rubbing from the inside layer straight out, not in circles, clockwise or counter clockwise like you would tend to think. the rings go straight out from middle to outer layer. Why? I have no idea, I just know this is fact. Disk doctor is a myth and won't fix anything. CRC's are bad sectors within the disc itself and is normal after much use and or wear and tear. There is no real cure for this. You'd have to get professional grade media which of course is dual layer and very expensive and hard to come by. If you try to re copy the ones with CRC's either you will not be able to copy as the sector break will be identified and will stop the process, or it may be very little, will process but the new copy will retain the exact same problem. I myself have gone through this with my DVD's. I used ritek and verbatim [known, very well liked brands] but I still have the same results with them as well. I just buy the store brand and don't even care anymore. I have a plextor burner and everything comes out perfect in the beginning and is copyable over and over. Eventually they all will wind up screwed somehow or another if they are watched over and over. You could also try using a laser cleaning utility inside your players, but if it happens on all of your players, that means its the disc not your player. Hope this helps. Yes it's bad news, but it's true. If you need more info. Do a search in the forums for "ScubaPete". He knows all kinds of tricks to help fight the good fight. But overall it's a losing battle.
HP A350N P4 2.8ghz 180gig hd with 1.5gig PC3200 DDR ram. Plextor 712a DVD-R,CD-R,Rom w/Buffer underrun and lossless technology, Media Ritek DVD-R
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