Its-edwin,

Thank you for using the Dell Community Forum.
It seems to be very hard to find info on this drive, I had to find it on a page that was selling it.
I could not find it on the LG web page, so I think it is purely an OEM drive and only sold to computer manufacturing companies. But in any case, the 24X writing speed is a CAV speed rating.
This means the writing speed changes as it goes across the cd media. So the drive starts writing
at a slower speed on the inside of the cd and it gets faster as it goes towards the outside of the cd. It is not a set speed of 24X when writing, the speed varies as it goes across the cd.

LG Electronics GCC-4241N 24X 24X 24CDRW/8XDVD:
Specifications:
Mfr Part Number: GCC-4241N
24x CD-RW & 8x DVD-ROM for Notebook
2MB Buffer memory with buffer underrun prevention technology
Write speed [CD-R] : 4x, 10x(CLV), 16x~16x(PCLV), 24x(CAV)
Write speed [CD-RW] : 4x, 10x(CLV), 10x~16x(PCAV), 24x(CAV)
Read speed [CD] : Max. 24x
Read speed [DVD] : Max. 8x
Loading Type : Motorized Tray
Mounting Type : Horizontal / Vertical
Interface Type : Internal E-IDE/ATAPI
Writing Method : Disc at OnceTrack at OnceVariable or Fixed Packet WriteMulti-session:

Additional info:
If a speed is reported as a CAV speed, the application will tell the user that this is a MAX speed. So for example, the 24x cd-rw drive might support 8x CLV, 12x CLV, and then 24x CAV. Since 8x and 12x are CLV speeds, they are 8x and 12x across the disc. there is no problem for the application to tell the user that they are recording at 8x or 12x. However, if the user selects 24x, then its only 24x on the outside of the disc and a slower speed on the inside of the disc. This is not a "true" 24x recording. So the application informs the user that this is a 24x MAX recording. This is the same way we have been selling our CD-ROMs and DVD-ROMs since their read speeds are CAV and not CLV.
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Its_edwin,

From what I have seen, this seems to be an inherent problem with Nero.
You may want to try getting the latest updates from the Nero web page.
I use Nero as well, I really don't like Roxio at all.
When using Nero I have noticed that sometimes it will only report the speed of the CD media
that you used last. So for example, if I used an 8X CDR or CDRW, Nero would only burn at
8X the next time. But, once I used a 24X CDR or CDRW, Nero would report that it could burn
at 24X speed again. This seems to be an intermittent problem that I have not found a solution for.
But, I have not tried very hard to find a solution since it is only a minor annoyance.
Try using a 24X CDR at whatever speed it allows you to use it at.
Then reboot the system and go back into Nero to see if you have 24X speed use again.

Also test the drive with another application.
At this point you are relying solely on Nero to give you the drive speeds.
Find another application that will give you the same information to verify that the problem
is with Nero.

Any update for this issue?

I am using 48X or 52X brand name CD-R all the time, but the option of speed in nero is only 4X for me. I think 10X is a OK speed, 4X is a little bit too slow. Wish there is a solution for this.

By the way, the combo drive in my 600m is 4240N. Driver version is 5.1.2535.0