[Solved] Thinkpad T480: Choosing a Second SSD Drive - M.2 2242 NVMe or Replace Primary M.2 2280 SSD?

Please help me in the following matter. I want to either add a second hard drive to replace the current hard drive in the T480. My laptop is on its way to me by courier.
At the moment it has a 256 GB ssd, I want to either replace it or add a second ssd.
From the discussion forums, however, I see that the solution I have in the T470 will not fit. Here I have a 256 GB drive and an added SATA3 M2 2242 drive.
Only NVMe drives can be used on the T480

From the forums I read that the T480 may have the following 2 drives (they may be installed together):
(1) M.2 2242 NVMe SSD disk in LTE modem slot.
(2) M.2 2280 SSD or 2.5" wide 7mm high SATA3 SSD/HDD disk. T
My guess is that my laptop will have a 2280 slot occupied.

So am I right in thinking that I need to buy such a disk?
https://allegro.pl/oferta/disk-wd-256gb-ssd-m-2-nvme-pcie-2242-pc-sn520-8222481412

Or is it better to replace the primary drive?
https://allegro.pl/oferta/disk-ssd-samsung-970-evo-plus-nvme-m-2-1tb-8251980034

But what about the Windows preinstalled there? There's probably some extra recovery partition in there.

Read and understand from the Lenovo forum
link
link
link

the rest after entering the phrase in google:
* e.g.: Thinkpad T480 upgrade SSD 1TB

ps
Please provide your T480 model specification
this link

Below is the interior of the above T480 from 2018

2242 PCIe NVMe 128GB M.2 SSD Toshiba (KBG30ZMT128G)
- M.2 2280 SSD installation via an adapter.

From what I read, you can even insert a SANDISK ULTRA 2TB SATA3 3D NAND drive, only I don't know if it can be 2.5 inch or must be 2280. The specification says that you can insert a 2.5 inch one, but I will check what the output is, if after removing I am able to slip a 2.5 inch (7 mm) drive into the pocket of the adapter.

I'm still looking for a drive, because it turned out that it's not that easy.
At the moment I am waiting for a response from Lenovo whether this drive is compatible. Rather, I have to replace the basic drive with a larger one, because 2242 NVMe drives are expensive and the maximum is 500 GB, or rather they are 256 GB.
https://www.morele.net/kingston-kc2000-2tb-m-2-pcie-nvme-skc2000m8-2000g-5938374/
I am not sure if all the parameters of this drive are in line with the Lenovo specification. NVMe is, it's not on Sata, it's on PCIe, but I still prefer to ask before I buy.

This one (Toshiba THNSN5256GPUK 256GB M.2 2280 SSD NVMe PCIe ) on ebay $50.
In the UK they sell with
- Samsung SSD PM981 MZVLB512HAJQ, 512GB link
* because Samsung is more expensive, approx. $80

ps
I asked

Quote:

Please provide your specs of T480 model under 8th gen cpu? Coffy Lake-U

i.e. what board, cpu

* no. the ones you gave mean nothing to me

There's just so little memory there...
Here's another drive compatible with what the Crucial T480 configurator advises:
https://www.morele.net/ssd-disk-samsung-970-evo-2tb-m-2-pci-e-nvme-mz-v7e2t0e-5521223/
On MLC bones.
On Alle ... without a guarantee for PLN 1300, with a guarantee for PLN 2064 ... Configurators of SSD manufacturers suggest that it will fit ...
As for SATA3, the forums say that you need to use an adapter, but that the SATA line is slow and that they advise against it.
As for the configuration, I will paste it in a moment, in Thinkpads you enter the serial number on the page and the configuration is displayed. I'll paste it soon.

Processor: 1x Intel Core i5-8250U Processor(Core i5-8250U)
Memory: 1x 8GB DDR42400
Operating System: Windows 10 Pro 64
Hard Drive: 1x 256PCIeNVMeOPAL
Wireless Network: 1x
ports: 1x
Camera: 1x RGB 720p HD Camera
Graphics: 1x Intel UHD 620
Monitor: 14.0 FHD
Included Warranty: 3 Year On-site
Type 20L5, 20L6

Add memory, there you have two slots.
SSD as described above.

look in (https://youtu.be/1YPQTR-02_Q)

After much consideration and questions on the Lenovo forum, I am buying a Samsung 1TB 970 PRO.
Here's why.
- In the main hard drive slot, you can install a Sata 3 or PCIe drive, but the PCIe interface is much faster than Sata 3 even if it is x2, not x4
- Because it will be a system disk and I plan to use the laptop intensively for at least 2 years - that is, every day for 12 hours, I wanted a disk with MLC chips, because they allow for a much larger number of writes than TLC disks - it is true that TLC chips are getting better and better, but on the laptop I will perform important calculations and store very important data, which is why I prefer MLC, after all, it will also have the operating system and system swap,
- The prices of 1 TB or 2 TB drives in stores with a guarantee are very high, and on Allegro I managed to find a 970 PRO drive for PLN 900 - it is new, has a boot guarantee, the same 1 TB drive costs PLN 1,500 in the store
- the second choice was the su900 2 TB drive for PLN 1,500, but the price knocked me out, I already thought PLN 900 was a very high price
When installing the disk into the main slot (m.2 2280) I will check if I have a free WWAN slot. If it is empty, I will buy a 2242 m.2 256 GB drive and back up my data there.
It's always better to buy the drive in the store and I'm taking a lot of risks, but the drive is brand new and costs close to half the retail price. For now, I'll put in a tiny 250 GB flash drive and use it to back up my data. It barely sticks out of the usb socket.

Finally, in the T480 I have a Samsung 970 Pro 1TB drive, and as an additional 512GB 2242 drive, probably from WD.