Hi,
Welcome to the community,
I just went through the thread in which you are asking that " How you can replace the HDD on this system N 5050 " so as this is quite difficult to replace because you need to open the laptop chassis , so what i would recommend you over here is that you should get in touch with a local technician or you can just go through the manual & I'll be providing you the link i.e. as follows :
(
http://support.dell.com/support/edocs/systems/insN5050/en/sm/html/hd-assem.htm#wp1179926 )
So in the above stated link you will see the manual of How to remove the HDD. So just go through it & if you need any further assistance so can just reply back to this thread & we will assist you further.
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Harpreet S Rana
Dell | Social Media Outreach | Global Social Media & Community