nobin varghese :
can i set up 32GB pen drive as instead of hard disk? if it is possible give me detailed steps .Now i have extensa 4620 without hard disk and a pen drive of 32 GB.For answers thanks in advance.
You can use a PC running Windows 8 to set up a bootable Pen drive for use with your Extensa provided the Extensa has the capability to boot from USB device (Check it's BIOS)
However, you can only set it up to boot from Linux, as far as I know it's not possible to install Windows to an external drive.
You would need to download a Linux ISO and then use YUMI to set up your drive.
Ubuntu Desktop should suit...
http://www.ubuntu.com/download/desktop
Once you've downloaded your ISO use YUMI to set up your Pen drive
http://www.pendrivelinux.com/yumi-multiboot-usb-creator/
Scroll down to
Then follow the instructions to set up your drive from here
http://www.ubuntu.com/download/desktop/create-a-usb-stick-on-windows