thanx for the suggessions kiran.rkk and rak007.
my dvd player is 2 yrs old (Phillips). and dvd writter i purchased just last week.
anyways, i guess my problem has solved. since the space on my machine is getting reduced, i decided to dump those dat files as data files on dvd till i get answer from u geeks. that way i dumped 3 movies on dvd, just to take a chance i tried to play it on dvd player and wov it worked perfectly. i just needed to press menu and it listed down the file name e.g. xxxx 1, xxxx 2 etc. , i required to select the file and it played well, with the same quality and sound of original video files.
i so could copy 3 complete hindi movies on 1 dvd. which i could paly on my comp using windows media player as well as on my phillips dvd player perfectly.
now answer me pls. , if i copy the 1 movie or say 1 part of a movie at a time, will i be able to play those when the dvd is fully written. i heard, that multisessions could read only latest data. since my media is cheap one for 8x it took me 2+ hrs to write it, in which time, my comp gets slow and can't work anymore. so will copyng 700 mb at a time and remaining in a multisessions will work ?
BTW, digit dvd's don't work in my dvd player, which i had checked long back. only image files u can see thru dvd player.