CD writer lead out error

unfortunately your CDRW unit is dead. It can't close sessions anymore ... that's how it usually happens when CDRWs  die. Expect power calibration errors too.
Maybe writing at lower speeds will grant your CDRW unit to write a few more CDs, but anyway the tool ended it's life.

Burner software? Writer model? Type of burn? Without more info...sounds like you've chosen the wrong media...try CDRW? Are you trying to "overburn"? Please give more info...T

I have had this problem with roxio and adaptec software,  i would try to download nero burning rom, you can obtain a demo version here
http://www.nero.com

try this and see if it helps,  it may help to lower your burn speed

OS: WinXP and Win98, Burner: Nero6, CD-R used:  Samsung 48X, CDs burnt at 32/40X.  No overburns.  The writer could not complete the session and often gives at sound "zoooop" as if the spindle motor gives out... I have already taken the unit to the service centre..... but of no use.

what do you mean by <<but of no use>> ???
What did they said?

Samsung Service centre has taken service charges (Rs 350 Indian Rupees) but the problem remains as it is.   The Service Engineer advised me to go in for new product that are available in the market now.