Hi Adnan,
In my previous post to your other thread, I mentioned that we couldn't find suitable suppliers for the brands and products you are looking for (that suit your requirements on shipping and product model) even outside of our directory.
We looked into the manufacturers' websites to check for their authorized distributors. On HGST's website, the only distributor they have that will cater to Pakistan resellers is Spectra Innovations Pte Ltd which is located in Singapore.
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Kindly contact them directly to inquire on how to become their partner or simply fill out their Dealer Application Form-
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With regards to SanDisk, sorry to say that there weren't distributors based in Pakistan. However, take a look at their Singapore based distributor.
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If the above supplier doesn't meet your requirements, you can refer here to access more distributors of SanDisk
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All the best!