Faulty HL-DT-ST DVDRW GS21N optical drive

I have a HL-DT-ST DVDRW GS21N optical drive in my MBP 15'' late 2008 which is faulty and does not take in a disc. Any suggestions...

You could take it to Apple and have them replace the drive or you could DIY by buying a new SuperDrive from OWC.
Clinton

Similar Messages

C2D LG/Hitatchi HL-DT-ST DVDRW GWA4080MA Optical Drive Boot Noise

I was just wondering if any other C2D Macbook Pro users with the new LG/Hitatchi optical drive have noticed a different sound coming from it when the computer boots compared to the sound the optical drive made in previous Macbook Pros and Powerbooks (MATSHITA DVD-R UJ-857D). The drive itself functions fine, but this is a replacement computer (which makes me paranoid to begin with), and between my previous C2D and the Powerbook before that, which both had the MATSHITA, the noise the optical drive makes when the computer boots is noticeably different--it's a short, quick noise, not as drawn out as before. I called Apple, and they hadn't heard anything about it, and told me to reset my SMC, which I did and no change in boot noise. I think the boot noise is functionally correct, just want to see if anyone else with the LG optical drive has noticed it...
C2D Macbook Pro Mac OS X (10.4.8)
C2D Macbook Pro Mac OS X (10.4.8)
C2D Macbook Pro Mac OS X (10.4.8)

I just had my optical drive replaced. The drive does make a different noise than the Matshita drive that was in the computer before. The noise that I'm hearing isn't anything to be worried about. I just take it to be that it is a different mechanism. And it is a noise that I've heard in other optical drives that I haven't had a problem with.

Faulty optical drive in mini mac, unable to use remote disc

Hi,
I have a Mac mini (Late 2009) running OS X Yosemite. The optical drive in the mini is no longer able to read CD's or DVD's
We need install adobe suite 6 and this is on DVD. We have tried to access 'remote disc' in finder but have hit a closed door.
Seems according to this article: Use the CD or DVD drive from another computer with your Mac - Apple Support
"You can't use a shared disc
If your Mac already has a built-in optical drive, or an external optical drive connected, you won't see the Remote Disc feature appear in the Finder or other apps."
So does anyone have any idea how I'm supposed to move forward in this scenario?
seems a little restrictive to make 'remote disc' disappear if you have an optical drive...
I have no interest in getting the mini repaired, especially when the technology already exists to do otherwise.
Very very stuck so would appreciate any suggestions.
thanks

- Connect an external optical drive via USB or FireWire (FW)
- If yo have another Mac with FW and optical drive boot the other Mac in Target Disk Mode and connect the two via FW. Your Mini can then access the internal drive on the other Mac
How to use and troubleshoot FireWire target disk mode - Apple Support
Remove.disconnect the faulty optical drive from the Mini. For how see:
http://eshop.macsales.com/installvideos/mac_mini_2009_opt/
It is not that hard. The optical drive in my late 2009 Mini failed about two years ago and I replaced it with a SSD.

External Optical Drive Not Recognized

I've been using a Pioneer DVR111 external firewire drive for the last few months. Until tonight it's performed flawlessly.
I ripped a couple of CDs into iTunes tonight, then when I tried to do another it wouldn't work. The CD wouldn't mount and the drive wasn't recognized by system profiler. I hear the drive spin up when the disc is inserted, but that's about it.
I then tried the disc in the internal drive. Also no response.
So I shut the computer down, unplugged everything and waited a few minutes. I think this is called resetting the PRAM or something like that.
I rebooted from the install disc and rann hardware test. Passed without problem.
I rebooted again and everything seemed fine. Both optical drives were recognized in Profiler.
However, when I inserted a disc in the external drive, it again wasn't recognized. And when I rechecked Profiler, the drive had disappeared. The internal drive, however, seems to have remained okay.
Does anyone have any idea what's going on here? Might this be caused by a faulty external drive, or something else? The external was working fine a couple of hours ago, and I'm a little bit spooked that my internal was acting oddly for a time.
Thanks in advance for the help.
ron
iMac Intel Duo Core Mac OS X (10.4.8)

Can you be more specific about "Arch Linux don't recognized it"?
Post the output of lsusb and dmesg.
Do you have an internal optical drive? If not, what's the output of 'cat /proc/sys/dev/cdrom/info'?

Optical drive (CD/DVD burner) not detected by Windows - dv9812us

I've been dealing with the same or at least a similar situation for the past week.
I've got an HP dv9812us running Vista home premium SP 2. The drive is detected by the BIOS because it attempts to boot from the drive, the light blinks, and you can open the drive via the button. Once Windows starts booting, though, it quits working entirely. It doesn't show up in the Computer folder and it doesn't show up in the Device Manager.
So far, I have tried:
1) Following the suggestions listed by HP here:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00678214&tmp_track_link=ot_faqs/top_issues/en_...
- similar to the link given previously, only specific to a notebook rather than a PC
- includes suggestions for running MS FixIt for drive limits
- checking for the presence of the drive in Device Manager
- uninstalling and reinstalling the drivers in Device Manager (which I can't do because the device isn't listed in the Device Manager)
- and downloading and installing the latest firmware and software for the drive (also can't do because Microsoft's software doesn't detect the drive).
2) Following the suggestions listed here by Apple because this problem is apparently common in conjunction with the installation of iTunes with Vista: http://support.apple.com/kb/TS2308
- repeats suggestion for download/reinstall for firmware/drivers for optical drive
- also: checking C:\Windows\System32\drivers folder for "afs.sys" or "afs2k.sys" files which may interfere with GEAR drivers for iTunes
- manually removing the GEAR drivers from your computer and registry and then reinstalling them.
3) Running the HP and Windows Update programs to make sure all of my software and firmware is up to date.
4) Uninstalling iTunes and downloading and reinstalling iTunes.
5) Physically removing and reinstalling the optical drive without powering up
6) Physically removing the drive, booting up, shutting down, reinstalling the drive, and booting up again.
7) Hard reset suggested by CherylG
8) Removing the optical drive from my roommate's Pavilion, exchanging the mounting bracket and bezel from mine, installing the known-good drive into my computer, and booting (everything was exactly the same as with my normal drive...worked in BIOS, quit working as soon as Windows began booting up)
9) Running sfc /scannow and found no corrupt files
10) Placing hammer where it can be seen by my laptop as sarcastically suggested by my friend Jason.
None of these have worked and I can't find any other suggestions listed anywhere. I'm keen on the iTunes issue simply because I hadn't really used the optical drive since I'd installed the newest version of iTunes and it had worked prior to that. Is there a way for me to find the drivers for the optical drive manually? Microsoft wants to find them itself, but since Windows doesn't detect the drive, all it does it tell me that Windows didn't detect the drive.

Hi, guys, I have had the exact same problem since the summer of 2010. Here's what I was able to find out.
Deleting upper/lower filters, running all those Fix Ya programs and other Microsoft crap is useless. This problem is most certainly has nothing to do with registry of any software on your computer. I took my HP 9620us to a couple of repair places and, they tried a lot of things and it appears that the root of this problem is a faulty motherboard connection. Of course, it costs about 400 bucks to fix it so I'm not sure I want to pay this kind of money.
Anyway, if somebody was able to fix it PLEASE post here to let us know. Again I am 99 per cent sure it's some piece of hardware in the motherboard.

CD/DVD Optical drive appears and then disappears, replacement also does not show up

My laptop: HP Pavilion dv9601AU
I have read a similar post here but my problem is different. My problem is that the DVD drive *sometimes* show up in My Computer and *sometimes* dont. Even the BIOS does not detect it. When I formatted my laptop with Windows 7, to my surprise it was gone. But it appeared again and I somehow installed all the required drivers from my driver DVD.... then it dissapered again. It never came back.
Failed attempt 1: I tried to re-format the PC using virtual drive but the problem persists.
Failed attempt 2: Thinking it to be a physical loose connection, I took it to local HP service station, they removed the drive, put it back firmly, but in vain.
Failed attempt 3: They attached other similar optical drive but to my surprise, the new drive was also not detected.
Failed attempt 4: I tried Microsoft's "Fix It" thing and also read about removing "upper filters" and "lower filters" in registry. However, I didnt have any of those filters entry in the first place so no question about making changes to the registry.
Facts:
1) The drivers are installed. There should not be any problem with the drivers.
2) The lens is perfect. I was able to install all the drivers from DVD when the drive appeared for a short period of time.
3) The HP logo tht appears upon starting the laptop lingers for a longer period of time compared to what it was doing so when the drive was fine.
4) The boot menu does not show the optical drive.
5) I live in India where normal room temperatures go upto 42 degrees Celcius and my laptop gets much much warm most of the times. I think some damage has been done to the internal circuitry.
Please, if somebody can provide me a solution to this. How can I get back my DVD Drive working. The support personnel here are having no clue (especially after learning the fact that their new optical drive also didnt show up) I hope I get some guidance from you guys as what should I do next. Please help me.
Message Edited by jal_desai on 10-09-2009 06:51 AM

I am having the exact same problem with my customer's dvd drive sometimes showing up during boot (BIOS) and sometimes not. Also ran full system diagnostic software and everything else tests fine, although the drive is not showing present. I have also tried 2 different drives but they do the same thing. I would go on to say that if you always left the dvd drive out of the laptop, your boot problems would probably go away. This would then tell you that it's not your drive at all, but the connections on the MOBO or the traces (wires) connecting the drive to the MOBO.
I work on computers and have for several years and most times this is related to a MOBO issue since that is the only item left in this situation. You know it's not the drive since it's been replaced with the same issue so drivers/firmware are not the case. I am assuming you have already updated the BIOS as well, but this shouldn't matter. There could be a dirty contact, faulty component, or a bad trace (wire) on the MOBO which is almost always harder to fix and is better to just replace the MOBO. However, replacing the MOBO is usually expensive when you have to buy the part and then pay someone to install it making it not usually the best option. Even if it is a dirty contact, it was probably caused by something that was spilled which could cause problems later. In this case, I am probably just going to recommend disabling the internal dvd drive and buying a slim external usb dvd drive, and then saving their money for a new laptop. You will still have to wait through a slower boot while staring at the HP screen, but I don't think replacing the MOBO is the most economical thing to do, unless you are the manufacturer and have several laying around.
I know this isn't good news, but it is what I've found to be the case in my experiences. Anybody else care to chime in?

IMac internal optical drive reads and plays cd's but DVD's spin for a few moments then eject. Then any drive utility access results in the spinning wheel of doom. Then the optical drive doesn't show up anywhere until a restart. OSX 10.6.8 - Intel Core 2

iMac internal drive locks up after trying to play a DVD. CD's work properly. All preference settings are correct. I have tried several different DVD's that work in other drives. Drive is : HL-DT-ST DVDRW GA11N. After spinning wheel of doom goes away, so does the optical drive in Disk Utility and System Profiler and no disks work because the drive isn't there until a restsrt. Any ideas? Thanks.

The battery alone is a $5 to $15 part. Hard drives vary in cost, and depending on the iMac, they may or may not be able to install a third party hard drive, or one resold through Apple. The resold through Apple drives tend to cost more. This article discusses the varying successes of third party drives on iMacs:
http://blog.macsales.com/10146-apple-further-restricts-upgrade-options-on-new-im acs
The labor costs depend on the store as well as the time to get the parts in stock. Call around.

How do you Install Win XP using Boot Camp without use of an optical drive?

So I'm about at my wits end. I'm try to get Windows XP on my OS 10.5.5 MacBook Pro. I've run into what seems to be a bit of a dead in. Unfortunately my optical drive has gone stupid on me and won't allow me to get through the entire set-up. The Mac has know trouble seeing the Installation Disc. After my partition has been created and I click start Windows Installer, the computer reboots in a normal fashion up to when you get the apple with spinning progress wheel. At this point the screen goes black and I get a "-" blinking in the top right corner of the screen. I figure it's just trying to boot from Win Install disk but it just kinda sits there. So here's my question. Is there some way to boot this Windows Installation from anything else but the CD? I luckily have an image of the WinXP CD in about 5 formats. I'm going absolutely crazy because I had just Installed WinXP not more than an hour before I ran into this initial problem but wanted to change the WinXP partition to FAT 32 as opposed to the NTSC format I accidently used. I would really appriciate any help in my dark hour.
System Info
MacBook Pro 4.1
Mac OS 10.5.5
Bootcamp 2.1
Windows XP with Service Pack 2
HL-DT-ST DVDRW GSA-S10N
System was just recently re-installed with fresh copy of a software and updates.

Kirkdan:
I really would like to help you and get your issue resolved in your dark hour as you said. I am afraid that I do not have good news for you. This is because the limitation put on by this entire process of installing Windows via boot camp.
The answer to you question to install windows from any other medium other than your built-in optical drive is a NO. This won't work since once Windows begins to install then it will not have all the drivers installed to recognize the external CD drive (USB/Firewire) and installation will halt.
Axel F.

Can someone help me with my optical Drive Issues

Hello Everyone.
I know there are a million discussions going on in this forum about optical drives. I have been reading them and trying to figure out what is going wrong with mine and am hoping someone can help.
My spec:
MacBookPro
10.5.8
2.33 Intel Core 2 Duo
HL-DT-ST DVDRW GWA4080MA:
Firmware Revision: AE39
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 0 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Media: Insert media and refresh to show available burn speeds
My Mac has never been very good at burning DVDs (no matter the brand of DVD) I often try to burn discs and get errors. Also, many times I will put a movie DVD into my drive only to have it not load and get ejected.
I've tried burning all kinds of DVD. DVD-R, DVD+R, Verbatim, Maxell, Memorex and I get about the same results everytime. Also... when I eject a DVD after the MAC has tried to burn my Mac often times puts a scratch on the DVD.
What can I do? From reading the post is doesn't sound like there is much I can do. I have apple care but... I think I've had my laptop more than 3 years... is my apple care any good anymore? How do I find out.
Is there any kind of firmware update for the optical drive?
Thanks
-Drew

For the burn errors you might want to try resetting your PRAM and SMC controller (this fixed an issue I once had), but the scratching of the disk suggests a physical problem with the drive itself.
I don't know how confident you are, but I replaced a DVD drive in a powerbook and it was relatively straightforward. A compatible drive should be fairly cheap, even second hand. If not get a quote from an apple certified engineer and see if that's more than buying an external drive. I have a full size DVD drive in a firewire enclosure which burns DVDs at 22x and rarely use the shipping drive for anything but watching DVDs.

Replacement optical drive for early 2008 MacBook

I own an early 2008 2.4 GHz Intel Core 2 Duo 13" MacBook that appears to have developed a fault with the MATSHITA DVD-R UJ-857E optical drive.
Unfortunately I am unable to get the optical drive replaced by Apple, as it seems they don't keep the parts for any machine over five years old. So I plan to replace the faulty unit myself. Can anyone recommend a replacement? The UJ-857E model doesn't appear to be available anywhere other than in the United states and then only as a refurbished unit and listed as an 857C which I assume to be from an earlier model.
I was wondering if there might be a more recent equivalent available that I might use instead. There seem to be several UJ-898 models for late 2008 MacBooks available, but I have no idea how much of a change Apple made to the internal configuration from early to late 2008.
Does anyone have any experience of replacing or upgrading their optical drive that they would be willing to share? I plan to follow the IFixit tutorials for the procedure. I just need to know what unit to buy as a replacement.

I would stick to what OWC (macsales) offers.
http://eshop.macsales.com/shop/superdrive/MacBook_13

Replacement Optical Drive Issues

A friend of mine had a label detach and disintegrate inside her DVD drive. I took it apart and cleaned all the bits and pieces out as best I could. When I put everything back together System Profiler couldn't detect a burning device. The drive seemed to be semi-functional because it sucked in a disk and made noises. Unfortunately, I could not eject the disk and found that I had to disassemble the iMac and drive again to get the disk out. I thought that perhaps the exploding label had somehow damaged the drive to the point the iMac couldn't recognize it so I found what I thought was a replacement on eBay. The iMac had a DVR-K05PA model installed but the eBay unit that showed up was a DVR-K05 (no PA suffix). I installed it anyway but I get the same result: System Profiler says no burning device was detected. The drive was advertised as fully functional but is it the wrong model number? Is the motherboard on this machine faulty or where else could the problem be? The machine works fine except for no DVD drive.

Hi Larry
What iMac, what OS X is it on, what Optical Drive came out, what Firmware Revision is listed in the System Profiler, is it the 17" Early 2006 4,1 listed in your Profile or some other iMac year/model....????
Start off reseting the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
and restart resetting the PRAM > http://support.apple.com/kb/HT1379
+1. Shut down the computer.+
+2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.+
+3. Turn on the computer.+
+4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.+
+5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.+
+6. Release the keys.+
Dennis
Message was edited by: den.thed
Woops' that's why they call me "day late and dollar short" I never say your second post.....

OPTIARC brand optical drive in new 24" iMac

I just noticed with my new 24" iMac (it's a replacement, first one had a faulty screen) - the optical drive is an "OPTIARC DVD RW AD-5630A" - the first iMac had a Masushita one.
I'm not sure if there's anything I can test it with - but it seems slow and it wouldn't recognise a couple of DVD titles when I initially put them in - I had to reboot, then they appeared.
Some quick searching found that OPTIARC is a Sony/NEC initiative; but that's all I could find about the drive.
Anyone had experience with these drives or had any problems?

Hi,
I had the problem in an old IMAC G3 just yesterday. After much experimentation I found the answer that is not written in any literature from Apple that I could find. Next to the reset key on the Apple G3 is another button that has no specific literature on and I pressed this key while starting the computer. I came to the firmware that gave me a choice between shutdown and start IMac. I said to myself, "I wonder if there is a command that would reject the DVD. I typed Eject, and it didn't recognize the command, I typed Eject DVD, and it didn't recognize the command, and then I typed, EJECT CD, and the stupid restore disk that didn't would with the system and there was nothing else I could do, came out and I immediately chucked in the garbage.
I did a new install and it works fine!

Satellite A30 CDRW-DVDRW (Mat****a) drive can't recognize any dvd

Hi!
I own a Satellite A30-303 with a optical drive MAT****A UJ811 (CDRW-DVDRW).
Everything worked just fine until last week the drive stopped reading any DVD. A error message saying that there is some problem with E/S is displayed. CDs are recognized with no problems though.
I tried to find updated drivers for the DVD driver but I couldn't get any.
Please does anyone have an idea of what that might be and how to solve it??
Thank you!!
Alex

Hello
On this way it is always not simply to say what the problem can be. Like littco wrote check if there is some virus or any kind of malware. It is also possible that there is some technical problem and the drive can not calibrate on the right way.
I really dont know what you mean with E/S but you can try to remove the device from device manager and restart the unit. The last thing that you can try is to reinstall the unit using recovery CD. On this way the unit will be absolutely clean. If the problem persist there is obviously malfunction and the drive must be replaced.
By the way; have the same opinion like littco.
Bye

PowerBook G4 does not see optical drive in System Profiler

I have a very strange situation in a powerbook G4 (1.67ghz, hi-res 15" screen).
I bought the laptop non-working, installed a new power board (plug on old one was fried!) Installed a 250gb HD which I had installed OSX on in another G4 laptop, and it booted up fine, or so I thought.
When I put in my Leopard install DVD to install over the existing 10.4 Tiger, the disc spun up, but would not mount - would not eject - and when I checked the System Profiler the superdrive was not recognized by the powerbook as being present on the ATA bus. The hard drive, of course, was seen on the ATA bus.
I thought the superdrive was bum, so I installed a known-working combo drive I had around from a previously parted laptop (Apple branded) and experienced EXACTLY the same situation.
Other things I have tried included using jumpers to manually set the hard drive to slave and cable select (from the factory, with no jumpers, it is set to master), thinking that perhaps the optical drive was somehow seen as master or cable select. All possible jumper settings I tried made no difference.
Booting from external firewire hard drive shows exactly the same situation on the ATA bus, EXCEPT (and this is where it gets just weird enough to pique my curiosity and keep me trying to fix it) - When I boot from the external drive WITHOUT AN INTERNAL DRIVE installed, the SUPERDRIVE SHOWS UP ON THE ATA BUS of the System Profiler! I have not yet seen both at the same time, but I can get one or the other to show, depending on, apparently, the presence of the internal hard drive.
Am I missing something here, or am I to assume a fault in the IDE controller of the logic board?
I have never seen this laptop working properly, but the seller I acquired it from stated that the optical drive worked fine until he fried the DC in-board, presumably with a faulty power supply. He had removed his hard drive to save the data on it.
Thanks for any help or clues that anyone might provide.
See another post with similar situation (archived, or I would have jumped on that thread):
http://discussions.apple.com/thread.jspa?threadID=1862129&tstart=0
Ray

Well, I am happy to report that the situation is resolved with my powerbook not seeing the superdrive, but I still do not really understand exactly why it was unavailable in the system profiler as I originally posted.
My particular solution was to wipe out (erase) the hard drive, zapped PMU, zapped PRAM, did the reset-nvram in open firmware, rechecked to make CERTAIN the proper cables were installed properly, and Now I just completed a fresh install of Leopard from the previously recalcitrant superdrive, to the now-clean hard drive.
My BEST GUESS as to what was wrong with the situation from the outset may have had something to do with where the hard drive came from and how that operating system was installed. (the OS was on the HD when I installed it) In hindsight, perhaps doing all the resets, as well as repairing permissions MIGHT have done it, but I got caught up in thinking it might be cables or something.
So, I would advise others with a similar problem to:
repair the hard drive
repair permissions on the hard drive
reset PMU
reset PRAM
boot to open firmware (hold command-option-o-f at boot) and type "reset-nvram" (without quotes) enter, the type "set-default" enter, then type "reset-all" enter
cross your fingers, knock on wood, and boot! See what happens....
if no glory, THEN look at cables (make certain they are the CORRECT cables and that they are seated properly) I bought a hard drive cable and an optical cable from ebay sellers with assurance that they were the proper cables, and NEITHER had the same part number as the original cable which I suspected faulty, and that in the end are actually GOOD! GO BY PART NUMBERS! do not accept someone elses assurance that their cable is the proper one!
then suspect faulty optical drive - if possible swap another drive in and check.
if a second optical fails, then SUSPECT logicboard, but before you invest in a new logic board ($$$$$) try putting a freshly erased HD in and just see if that helps.
good luck to you all with your mac troubleshooting!
and thanks to all who read and pondered....
I will mark this case "answered" though it is more closed than truly answered.
I am very relieved that the fault did not lie in any of the major components (or even the minor ones for that matter)
It turned out to be only software/installation/settings, even though the symptoms certainly seemed to point to a hardware issue. It pays to try the resets and repairs!
Ray

Possible solution to your Optical Drive failure

Hey everyone. So I've been having the same issue that it seems like everyone else has been having with their optical drive spitting out DVDs and CDs.
Well first off here are the specs of my drive:
HL-DT-ST DVDRW GSA-S10N:
Model: HL-DT-ST DVDRW GSA-S10N
Revision: AP09
Serial Number: K0078710705
Detachable Drive: No
Protocol: ATAPI
Unit Number: 0
Socket Type: Internal
Low Power Polling: Yes
Power Off: Yes
So it's the same as drive thats been causing lots of problems. My issues started about 5 months ago. One day my drive was able to read/write DVDs just fine but then out of the blue it stopped writing DVDs. I was a little upset but whatever right? I didn't REALLY need to write DVDs. Then it all together stopped reading DVDs that's when I got a little ticked. So then I searched the web for an answer but came up the conclusion that I needed a new drive but the problem is my warranty is over. So then I pretty much gave up. Not really wanting to pay $150 for a new drive I tried to forget that my $2000 macbook pro was crippled. Tonight though I thought about it again. I thought of how disc drives work. Inside there is a laser that reads the disc. Remember your walkman? Before the age of the ipod. It always had a tag right by the laser that said "Don't Touch." So then I thought, "maybe the laser in my disc drive is dirty." So I grabbed my can of compressed air and stuck the straw attachment into the slot. After spraying for few seconds I loaded a normal dvd in and PRESTO IT WORKS! I couldn't believe it. IT WAS DIRTY!
This might not work for you maybe there is some thing seriously wrong with the hardware or the software. But right now what do you have to lose right? Before you run off and buy a new drive try cleaning the lens with some compressed air.
BOTTOM LINE: TRY COMPRESSED AIR. It worked for me =D

my macbook pro is just over one year old, and my inernal dvdrw also stopped working with dvd disks (it still worked with cd disks).
i stuck the nozzle of my spray air into the drive slot, sprayed three times and VOILA, my drive reads and writes dvds again!
amazing and easy fix!!

Faulty HL-DT-ST DVDRW GS21N optical drive

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