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@abhipatabhi wrote:

2. Right now I have 1TB HDD & 128 GB SSD. I wanted to upgrade the SSD to 512 GB. Is it possible ? I have shortlisted a WD SSD M.2 NVMe model. 

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Definitely, yes. You could go all the way to 4 TB if you wanted to and if you needed that much capacity. Just for comparison, here are some Crucial SSDs that are compatible with your laptop. Any of the major brands should be good.

Follow the removal and installation procedures in the Service Manual.

Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard. (Repeatedly touching a metal case part is not sufficient mitigation with modern components.)

I have a 5577.

I have upgraded mine to a 512 SSD without problems. I saw one post of a user who successfully installed a 1 TB NVME in his 5577.

I also have a 1TB SSD in the second drive slot.

Which SSD you are using ?  I am planning for 

https://www.amazon.in/Samsung-Internal-Solid-State-MZ-V7S500BW/dp/B07MFBLN7K/ref=sr_1_10?keywords=m.2+2280+ssd&qid=1689007929&s=computers&sprefix=M.2+22%2Ccomputers%2C236&sr=1-10

if i would have to choose between Crucial or other storage brands famous here in india, like WD, Samsung etc., which one you'll suggest? i have shortlisted this one --- https://www.amazon.in/Samsung-Internal-Solid-State-MZ-V7S500BW/dp/B07MFBLN7K/ref=sr_1_10?keywords=m.2+2280+ssd&qid=1689007929&s=computers&sprefix=M.2+22%2Ccomputers%2C236&sr=1-10

I don't remember the model number but it was a Samsung.

I have used Crucial and Western Digital, without problems, but most of my SSD's are Samsung.