is it possible to add a second drive to 15s-eq1048au laptop?

[Jason-_54321]

I have a 15s-eq1048au laptop with the M.2 SSD which is 250GB. There's not much space left already...

I found the specs from my previous post on this at Solved: Re: Upgrade or add 15s-eq1048au hard disk/SSD - HP Support Community - 8288055 but I can't reply there... There's an SD card slot and wondering if I can stick a large-capacity SD card in there and use that as a hard disk instead?

From the previous post, I was told that I'd have to replace the hard disk, instead of that are there splitters that mean I could mount a second disk off that? If not, how do I transfer data from the smaller drive to a bigger drive and still have it bootable, etc.?

[Huffer]

An SD card can be mounted and assigned a drive letter and will work essentially as a hard drive. Its going to be slower than an internal SSD but would be adequate just to park files like pictures, docs, and videos. Yes, the laptop has a single internal slot for storage using an M.2 2280 "gumstick" type drive. This can be removed and replaced with a larger capacity SSD of the same type...you want an NVME M.2 SSD. No such thing as a splitter....there is no additional physical room for a second drive in any event. Capacities to 2 TBs are commonly available. 

You need an external drive to do a backup of the existing installation and then when you put in the new drive you restore the contents of that image to the new larger drive. That is probably the most direct way to do it but there are others. If you need step by step instructions we can help further.