USAFRet: you're right, and I missed that obvious clue!
OP, if you are booting from an SSD into any recent Windows, then you should have no problem. The ONLY thing you will need to verify is that your Windows has the driver for a HDD partitioned in the GUID (aka GPT) style, which I expect is going to be yes.
Your thread mentions cloning, and I suggest that is the best method for you. As I understand, you want to create on this new 4TB unit two separate "Drives" (that is, one Partition for each), and each will be a COMPLETE copy of everything on your old 1 TB units. I have done this on a simpler system. I was making backups of two internal HDD's to a larger external HDD in an enclosure. I used the free software utility available from the maker of my external HDD (that was my DESTINATION drive when cloning). First I ensured the external unit was empty. Then I made a clone of my C: drive, setting its size larger than the space needed, but about half the capacity of the external unit. When making a clone normally you should expect to find in its menus a way to specify the size of the new clone copy, not just accept some suggestion. And of course, since this was my C: drive (NOT your case) I set it to be bootable. When that was done, the HDD still had half of its space Unallocated. Then I ran another cloning operation, this time copying the second HDD into a non-bootable new Partition that occupied the rest of that space. Everything worked perfectly, and I could access both of those new "drives" on the external unit in Windows. So I'm sure you can do much the same process.
BUT you have a couple of items to do that I did not need. You need to get a cloning tool. As I said, look for one on the website of the maker of your new 4 TB unit. They usually have such for free, BUT it will make clone copies TO only their HDD's as an inducement for you to buy their drive and move your data to it. Make sure you get the manual for this utility and read the relevant section so you know where its menu items are and what they can do for you. Often, this utility does many more things than cloning, so you won't need to read everything. Seagate has their Disk Wizard utility package; WD has Acronis True Image WD Edition. In your case, with Windows running from your SSD, you can download and install the For Windows version of whichever and run it like any other application software. The cloning tool will do all the work of Creating Partitions, Formatting them, and copying everything for each clone copy you make.
Check the manual for these details on how to set what you want.
1. You need to have it Partition your new HDD using the GPT system, not the older MBR system, even though your old 1 TB units likely were MBR. This setting will be important for making the FIRST Partition and clone; after that, the GPT Partition Table system already is installed.
2. Note the size of the 4 TB unit as you start the first cloning. Decide how you will split that space into two "drives" - I'm guessing each will be about half the 4 TB space, but that's up to you. Find the info in the instructions for how to specify the Partition size on each run.
3. Be sure the Partition created in each case is NOT bootable, since you will use this for data only.
4. On each run you will have the option to have it do a Full Format (usually the default) or a Quick Format. A Full Format tests every Sector of the new Partition before writing anything to it, so it takes a lot of time, but that's the super-safe way because it ensures there are NO Bad Sectors on the HDD. So just be patient until it finishes. If you choose the Quick Format (a brand new drive is a good bet for having no Bad Sectors anyway!) that long testing process will be skipped and the process will be quicker.
Although my experience above used an external enclosure because I was making a backup set, your work can be done entirely with the new drive mounted internally. In fact, that is easier and likely faster since it avoids the slowing effect of an interface to an external device. After you're done IF you are removing your 1 TB units you can shut down and re-arrange the position and cabling if you wish.
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