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Msg: could not locate valid CDEX supported CD

I am getting a message: Could not locate a valid cdex supportd cd drive-aborting.

Any idea what this means?
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1 Solution
Patricia Siu-Lai HoCommented:
rdaves, Try to inspect if your cdrom driver is in the right path/folder and placed in the files of config.sys and autoexec.bat as following:-  

Go to Start-run-type "sysedit" without the quotation, OK to open system configuartion editor.

Select the "Config.sys"


Select the "autoexec.bat"


Save the files.

You may replace the cdrom driver "OAKCDROM.SYS" to be your own cdrom specific driver.
Or you may extract following 2 files from the win98cdrom if they are corrupted.


They are in Win98cdrom:\BASE5.CAB
and also placed on Emergency Boot Disk.

You may use windows explorer to double-click the Base5.cab to extract the above mentioned files.
You may go to Start-run, type 'sfc' without quotation. Extract one file from installation disk.
Tell me if you have any queries or it is worked.       pslh
RDaves, does this question go also with your other cd rom drive question. This error, "Could not locate a valid cdex supportd cd" leads me to think that your PC can't find a valid cd rom drive when it boots. Does the cd rom drive work at all?
rdavesAuthor Commented:
Yes, this does go along with the other question I asked.  The CD ROM works when I boot from a floppy startup disk.  In fact, right now, it is taking part in the re-installation of W98 after a reformatting and repartitioning of the Hard Drive. Following instructions in a manual, I copied config.sys from the startup disk to the C drive.  When I try to start the computer, I am told that the following files are missing:
Do any of these files have anything to do with my problem.  What are they?
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rdavesAuthor Commented:
I will try your suggestions.
Muchos Gracias
Patricia Siu-Lai HoCommented:
rdaves, I think Dennis is following your other previous question. Perhaps, you should consider his advices as a whole.

<<I copied config.sys from the startup disk to the C drive.  When I try to start the computer, I am told that the following files are missing: >>
First, You have to change the path. In the startup floppy, these files are in the virtual drive created using the RAM memory. In normal window bootup, this virtual drive will be removed.

Therefore, you have to change the file path to C:\WINDOWS\COMMAND\EBD\

Second, there may be certain files that you may not need and you can cancel them.

oakcdrom.sys - Generic device driver for ATAPI CD-ROM drives      
btdosm.sys    -  Mylex/BusLogic CD-ROM driver
flashpt.sys     -  Mylex/BusLogic CD-ROM driver
btcdrom.sys   -  Mylex/BusLogic CD-ROM driver      
aspi2dos.sys  -  Real-Mode Adaptec CD-ROM driver
aspi8dos.sys -   Real-Mode Adaptec CD-ROM driver
aspi4dos.sys -   Real-Mode Adaptec CD-ROM driver       
aspi8u2.sys   -   Real-Mode Adaptec CD-ROM driver

The Windows 98 Statup Disk includes generic ATAPI IDE & SCSI CD-ROM drivers
that allow your CD-ROM to function at Dos when the Windows 98 GUI is not

NOTE: Not all CD-Rom drives are supported. If your CD-Rom drive does not
function with these drivers, you must use the drivers that came with your
CD-Rom drive.      

You can delete all of them (using your own cd-rom driver) or using the generic oakcdrom.sys.
RDaves, if you boot to the Windows 98 Startup boot disk, (make sure that format.com is present on the floppy), you should be able to format the "C" drive, reboot to the floppy and then install Win98 without copying config.sys.

Here's the plan.

1. Make sure that Format.com is on the Win98 startup floppy. If its not, and you have another Win98 machine, just use Find, Files and Folders and copy it to the floppy.

2. Now boot to the floppy and choose Without CD Rom Drive Support for now and format the "C" drive, as in:

FORMAT C:/S<enter>

3. Once the format is done, pop the floppy out and reboot to make sure that the "C" drive boots okay. If it does, then reboot to the Win98 floppy again, and now choose "With CD Rom Drive Support".

NOTE: When you boot to this floppy, it will create a ram drive in memory and will assign it a drive letter. Since I do not know how many partitions you created, I'll presume you only created one, "C". Therefore, once you boot to the setup disk, this is what the drive letter assignments should be:

C: For your first hard drive partition.
D: The Ram Drive
E: Your CD Rom Drive.

If you have two partitions, they will be "C" and "D" respecively and the ram drive and CD thereafter.

4. Now that you are aware of the above, and presuming one partition, run setup from the CD by typing:


Once you are up and running you can REM out the D drive. Also I have seen on the Hewlett Packard Config.sys, a statement loading a device for a cd rom and a statement that it is not needed. Strange sityuation. Just REM it out.
Gonzal, I understand your need or want to type today, but really, rem out the "D" when it's only a ramdrive created temporarily. Want to give us a clue where you would rem this out once RDaves straightens out the config.sys to where it should be?
rdavesAuthor Commented:
Using your info, I was able to muddle through.  Reformatted hard drive, then installed W98.  I have three partitions: C, D and E.  Plus had an F for the ramdrive, but rem'd it out.  The CD is now F.  Thanks for the help.
You can just delete that line rather than rem'ing it out. As a matter of fact, you can rename both config.sys and autoexec.bat to config.old and autoexec.old respectively and the system should run just fine!

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