HL-DT-ST DVD-RAM GSA-H55N ATA Device Wont read DVD's but reads CD.....

Try running the automated fix from Microsoft
Your CD or DVD drive cannot read or write media
Good luck and I hope this helps, and if it did please dont forget to rep me

that is strange, did the program give you any error messages? what was you're result? maybe try running it again. i had a broblem with an dvd/cd drive in my laptop about 3 months ago and this method fixed it, with me it wasn't showing up in device manager either, but that was before running the microsoft utility.

sorry for the slow reply, im mobile on my hp ipaq pda.

this may seem like a stupid question, but do you have software or codecs to view you're dvds? if you dont i sugest using vlc media player from video lan.

sorry i cant post a link right now...still mobile

okay, now im actualy at a desktop. I have a question, when you put in a dvd and try to browse it using my computer do you get: "Insert a disk Please insert a disk into drive X"(replace x with you drive)?
You could try this: (go down to post 8)
but then again you might not, depending on youre situation.
HL-DT-ST DVD-RAM GSA-H55N Problem!!!! - Club MyCE

Step 1: Start Registry Editor
Click Start, click Run, type regedit, and then click OK. Registry Editor starts.
Step 2: Delete the UpperFilters registry entry
1. In Registry Editor, expand My Computer, and then expand HKEY_LOCAL_MACHINE.
2. Expand [COLOR=green !important][COLOR=green !important]SYSTEM[/COLOR][/COLOR], and then expand CurrentControlSet.
3. Expand Control, and then expand Class.
4. Under Class, click {4D36E965-E325-11CE-BFC1-08002BE10318}.
5. In the right pane (topic area), click UpperFilters.

Note An UpperFilters.bak registry entry may also appear. To delete the UpperFilters registry entry, you must click UpperFilters and not UpperFilters.bak.
6. On the Edit menu, click Delete.
7. When you receive the following message, click Yes to confirm the deletion of the UpperFilters registry entry:
Are you sure you want to delete this value?
The UpperFilters registry entry is removed from the {4D36E965-E325-11CE-BFC1-08002BE10318} registry subkey.

Note Do not exit Registry Editor. You must have this program for the next step.
Step 3: Delete the LowerFilters registry entry
1. In Registry Editor, expand My Computer, and then expand HKEY_LOCAL_MACHINE.
2. Expand SYSTEM, and then expand CurrentControlSet.
3. Expand Control, and then expand Class.
4. Under Class, click {4D36E965-E325-11CE-BFC1-08002BE10318}.
5. In the right pane (topic area), click LowerFilters.

Note An LowerFilters.bak registry entry may also appear. To delete the LowerFilters registry entry, you must click LowerFilters and not LowerFilters.bak.
6. On the Edit menu, click Delete.
7. When you receive the following message, click Yes to confirm the deletion of the LowerFilters registry entry:
Are you sure you want to delete this value?
The LowerFilters registry entry is removed from the {4D36E965-E325-11CE-BFC1-08002BE10318} registry subkey.
8. Exit Registry Editor.

Step 4: Restart the computer
If a CD recording program no longer works after you restart the computer, you must reinstall the CD recording program.
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do all that but i think you will only find the lowerfilter only so just delete that and reboot

that is realy strange, but after reading on the internet i belive that youre drive came with nero/software of some sort,yes? I had a drive similar to yours about a year back in a toshiba laptop, but i had to constatly change wether it would be in "CD mode" or "DVD Mode" with an included util, I hated it.