DVD burned at 8x by 24x burner not readable by older DVD burners

[Man-wai Chang to The Door (33600bps)]

The Maxell DVD-R (8x) was burned by LG GH24-NS50. It's not readable by
LG H62L nor older LG 4167B!!!

Is this normal?

And it seems the GH24-NS50 could not burn DVD at speed slower than 8x.

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.33.2
^ ^ 20:53:01 up 19 days 12:45 2 users load average: 1.04 1.05 1.07
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

 

[Man-wai Chang to The Door (33600bps)]

And it seems the GH24-NS50 could not burn DVD at speed slower than 8x.

ImgBurn allows me to choose 2x as writing speed. LG Burning Tool &
InfraRecorder don't allow that.

All I need to do is to building an disc image first via InfraRecorder,
then burn the image to the disc using ImgBurn.

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.33.2
^ ^ 16:28:01 up 21 days 8:20 2 users load average: 1.00 1.02 1.00
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa