Help! Flashed DRU18a and now it doesn't recognize Any discs



I own the following:

HP Pavilion Media Center TV m7590n Desktop PC
Serial Number: MX36250HVZ
Product Number: ex333aa
It has a DVD/CD Rewritable Drive Unit SONY DW-U18A installed in the Secondary Slave (Expansion Bay area.

Any way, the drive stopped burning CD-R media and so I read up on upgrading the firmware to tried to fix the problem, after I tried everything else I could think of. I found here that I can flash it to 832S (CG3B) which I did. The drive now showed up in properties as Sony DRU-700A. This changed the whole dynamics of the drive. It stopped reading any type of media consistently after a day, so I flashed it back to the original firmware using the bin file I created before the flash, which made the device show up as SONY DW-U18A again. It still only recognizes some media some time, but not all of the time.

Also, it really has a hard time recognizing CDs and DVDs that are purchased, and I cannot install any software using any type of disc-media on a consistent basis. My question is, how do I get the drive back to it’s factory installed firmware, and if I buy another drive of the same kind, will it automatically install the firmware from the new drive on install? Or should I just purchase another type of compatible drive? Does anyone know where I can find a list of compatible drives for this model? Also, will I need a disc to accompany the drive if I have to purchase one, in order to change the firmware? This thing was suppose to read cds/dvds and write cds and dvds. Now it is just frustrating.


Looking at the HP M7590n computer specifications online, it is a basic desktop computer and should be able to use any modern dvd burner as a replacement. An older drive like this will use the IDE/PATA connection rather than the newer SATA connection. Burners that have an IDE connection are getting harder to find, but there are a few still available at shops like, and

Here is an example of a replacement:


Thank you! But will a new drive fix the firmware issue? What I mean is, will the drive I currently have still show up when I uninstall it and install another type of drive? Is Firmware already stored in the Flash ROM of the new drive or does it have to be installed and changed using a disc? Will a new drive fix the problem I’m having? Or is there another way?


The firmware is contained in a rom chip on the drive itself. When you replace the drive, the new one will have its own firmware, and will not be affected by the earlier problems.

The only possible problem might be if you have slipped into PIO mode instead of DMA mode for the optical drives. I suggest not borrowing trouble however, and simply install a new drive and see if it works properly. I sincerely doubt you’ll have any issues.

On the very, very slim chance you do have a problem with the mode setting, get a free burning program called ImgBurn.
Install it, click on any of the options, like Discovery, then click on Tools at the top of the window in ImgBurn. You’ll get a drop down list that includes Reset DMA. Follow the instructions for this, then reboot your machine. That should do it.

Your current drive is very old and isn’t compatible with many newer blank dvds, so replacing it is probably the best option for you.


Just put in a new HL-DT-ST GSA-H21L and I have the same problem. Basically, it’s like the computer just decided to stop recognizing any cd/dvd drive . Could a bad flash do this? I know for a fact the flashes were successful. Something isn’t right, but I have no idea what it is.


Try removing the upper and lower filters.

This can be done through ImgBurn…click any option then hit Tools–>Filter Driver Load Order. Highlight any upper and lower filter found and remove them. Then exit and reboot the machine.

Or you can follow this guide if you are comfortable working in the registry of your operating system:


By the way, there is a jumper on the back of an IDE drive that must be set correctly. If you have attached the drive as a slave drive, this jumper must be set to the slave position, or on many machines, the jumper can also be set to Cable Select.


I did this: Now, after restart, it doesn’t even recognize the E: drive, the drive the burner is/was on. I don’t even see it in device manager anymore, and when I insert a disc, nothing happened but a flashing green light for thirty seconds then it stops.


Well, that’s not good. What type of IDE cable are you using? Is it a 40 wire cable or an 80 wire cable?

In this picture you’ll see the two types, with the 80 wire cable on top. You should be using an 80 wire cable with your optical drive. These two are brown, but they are normally grey in color.

You may have a bad cable, even if it is the correct type.

If you are trying to set up the drive as a slave drive it should be connected to the middle connection. And you need the jumper on the back of the drive set to Slave. The connector at the very end of the cable goes to the Master drive.


80… but I restarted again and it showed back up. But do I slide the jumper to move it or what? BTW, I put in a pinnacle studio software dvd and it read it, but not much else. I don’t know what to make of it.


If it is showing up again and reading disks, the jumper is probably ok. You can check it to be sure.

To move a jumper you pull it straight off the two pins it is on, then move to the correct two pins.


I did all that. When I look at the E: drive, it’s like it’s been turned into a folder. I don’t get it. This has never happened to anyone else before? Is it possible that the motherboard was flashed instead? I mean, I put in a whole new drive, a whole different model, and checked everything you said check, but to no avail. I’m starting to think that my computer will NEVER read a disc again…


Could i be a driver issue? If so, how do I check?


Start up in SAFE MODE (hit F8 at startup) and check the optical drive with CD and DVD media and also with a tool like dvdinfopro, imgburn or nero cd dvd speed.


I just don’t get why it turned into a folder. For instance, I can leave the dvd/cd tray empty, click on it and it will open up like an empty folder. Then I can copy and place files in there like a folder. Is this normal? Has anyone had this issue after a firmware flash?


Go to Device Manager. Find the listing for the dvd drive and right click on it. This gives you some options. Click on Uninstall. Once the drive is uninstalled, reboot the machine and let the operating system find the drive again.


I’ve been doing that constantly, to no avail. I swapped the new optical drive out of another HP Media Center, the LiteOn GSA-H21L , I mean. Perhaps it’s got it’s own issues. I have a friend that said he would give me his drive, if he has one that is compatible, so I am meeting him tonight, hopefully. BTW, it’s a 40 pin, he said. He works with computers. Trying to prevent having to pay him to fix the problem, plus, he doesn’t have much time to do it anytime soon. I put the DW-U18a back inside and put the GSA-H21L back in it’s case and it doesn’t read discs in it’s original HP box either, so I guess I have two bum drives on my hands. A shame if that’s the case. They’re some beauts!


All the IDE drives are 40 pin. An 80 wire cable uses extra wires between the ones that carry current to prevent crosstalk.

Good luck on this. I don’t feel like I’ve been much help, but there are really only a limited number of things to try when troubleshooting optical drives.


Thanks Kerry! For all your help. I’ll report back once I get the new drive in.


Error 1327: Invalid Drive

This error has several causes. One cause is that the installation was created with a hard-coded path to a drive letter that does not exist on the machine. If this is the case then there is no way to make the installation install to a different drive letter. The software vendor must be contacted. Other causes include:

           i.    The CD-ROM or DVD-ROM drive letter has changed since a previous install.
                        ii.    You have changed the drive letter of the hard disk that the operating system is installed on, for example, drive C.
 iii.    This behavior may occur if a registry key contains an incorrect value in a Data field.

Because this error has different causes, you may have to check multiple items on your computer i. If drive letters have been changed on your computer, re-assign the original letter to the CD-ROM, DVD-ROM, or operating system drive. Follow the steps appropriate to your operating system:

ii. Windows XP Users
A. Click Start, and then click Control Panel.
B. In Control Panel, double-click Administrative Tools, and then double-click Computer Management.
C. In the Computer Management tree, click Disk Management.
D. Right-click the CD-ROM or DVD-ROM drive, or the drive that contains the operating system, and then click Change Drive Letter and Paths.
E. Click Change, and change it to the original drive letter. Click Ok, and then click Close.
iii. Windows 2000 Users
F. Click Start, point to Settings, and then click Control Panel.
G. In Control Panel, double-click Administrative Tools, and then double-click Computer Management.
H. In the Computer Management tree, click Disk Management.
I. Right-click the CD-ROM or DVD-ROM drive, or the drive that contains the operating system, and then click Change Drive Letter and Path.
J. Click Edit, and change it to the original drive letter. Click Ok, and then click Close.
iv. Windows NT Users
K. Click Start, and then click Run.
L. In the Run dialog box, type windisk.exe in the Open field, and then click Ok. This opens Disk Administrator.
M. Find the letter of the CD-ROM or DVD-ROM drive, or the drive that contains the operating system that needs to be changed back to its original letter.
N. Right-click the drive letter and select Assign Drive Letter.
O. In the Assign Drive Letter dialog box, select the original drive letter from the drop-down list.
P. Close Disk Administrator, accept the changes, and restart the computer.

Verify that registry entries do not contain invalid drive letters that might be causing this error:

Important: The following steps require you to modify the Windows registry. Modifications to the Windows registry, if not done correctly, can cause serious problems to a Windows system. Before editing the registry, see How Do I Back up Registry Keys on My Computer?
a. Click Start, and then click Run. The Run dialog box opens.
b. In the Open field, type regedit, and then click Ok. The Registry Editor opens.
c. In the Registry Editor, locate the following registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
d. In the right pane, note the values in the Data column of each entry. If any value contains a drive that is not correct for your computer, right-click the entry and select Modify.
e. Type the correct drive letter in the Value data field, and then click Ok. For example, if one of the values is “X:\Documents and Settings\Administrator”, the drive letter should be changed to a valid drive on the system, such as “C:\Documents and Settings\Administrator".
f. Repeat steps 4 and 5 for each entry whose Data value contains an incorrect drive.
g. Repeat steps 3 through 6 for each of the following registry keys:
i. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
ii. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
iii. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
iv. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
h. Close the Registry Editor and run the installation again.