thank you very much for the support guys.
i decided to buy 250 gb hdd initially.today i went to sp road ,asked for 250 gb wd ide hdd in one store called sahara .he offered it for 2675+tax.but he didnt have wd so
went to golchha intertrade ,he also didnt have wd 250 gb hdd.infact he didnt have any internal hard disk except seagate.he offered 320 gb for 2900+tax=3016,paid 3000.
5 YR WARRANTY.
so finally bought seagate baracuda 7200.1 ST3320620A.
