Where can i buy hard drive for 4GB Xbox360E in Delhi?

I have an XBox360S; supposedly no hard drive besides the 250GB or 320GB will play original XBox games. On top of that, the 20GB hard drive I have won't even play XBox360 games (it can transfer data to and from the console, but it will not directly play the
game from the hard drive). So, for all XBox360S buyers, you have to buy at least the 250GB hard drive that fits into the slim itself to play original XBox games; no external hard drive (that I know of) is 100% compatible with the slim version for any kind
of XBox game, 360 or original. The 4GB flash drive that comes with the "base" slim is OK for most games but it can crash or slow down during intense moments.

What hard drive does it have and where did you buy it? If your console is the 4GB model, then that is flash memory. Original Xbox games require an official hard drive, they won't work with the 4GB Slim's built in storage.

i have the same issue as described here, but after reading all these posts i still dont know if a usb stick or an external hard drive will work. i also looked at my 4gb slim and dont see where the cover can come off to install an additional hard drive .

even if i wanted to go to Microsoft and buy their own hard drive , can i have it installed to my 4gb slim??

No. Usb flash drives are not considered hard drives just like the internal flash drives on the 4gb slim. You will need an official xbox360 hard drive to play those titles.

The difference is the the 250Gb X360 has a 250Gb hard drive, and the 4Gb X360 has a 4Gb internal memory....and that is all. You can buy a 250Gb hard drive and install it into the 4Gb X360 if you want.