HELP! New to Windows - New 1TB SSD - need to swap 256mb C drive SSD

I suggest the one thing you do is leave C: at its current size until you've thought through your data placement and backup strategy.

If it does get extended to fill the 1Tb space, you can change it later of course.

Once this is complete

- take a look at the 1Tb drive with a partition manager and check it's as expected.

Then remove the 256 Mb drive, taking due precautions (anti-static).

Try your cloned drive in place as the only drive. You may have boot problems initially as I mentioned. If so others can advise.

I don't know if you're swapping the drive in the same slots, if they're the same interface type and form factor for example.... what you don't want is both drives in your system with Win 10 on them.

Then try booting.

If ok, and you're happy with the partition layout, create your first disk image (Macrium Reflect/ Aomei Backupper) to USB drive

I would simply set the 256 Mb drive aside for a couple of weeks just in case, until you're confident with the new system. If you need to make partition changes, you've still got it as a backup.

Then you can format it and use it as a spare drive (not a 'hard' drive of course!)

That's a clone- with C: unchanged. You can see the extra space as 'unallocated'.

I note your page file is on your other drive. Hope that doesn't cause a problem.

Now you can see if it boots.. or not.
It would help to know if both drives are SATA or one was M2 for example - i.e. whether this was a direct physical replacement.

Were you to look at the partitions with a 3rd party partition manager you should see another 16 MB partition not shown by Disk Management.

Thecount said:

Something strange going on. Seems like it’s called itself C drive as well. I’ve unplugged the old smaller C drive. Btw it’s a 2tb drive, my bad ��

Anyway see attached. It still thinks it’s a small drive on one of the screen

- - - Updated - - -

and this one

Presumably disk 0 is the new disk after os migration.

Seems like it’s called itself C drive as well.

Yes the os letter remains the same. That is normal.

It still thinks it’s a small drive

There was an option to change partition sizes during the migration, It says that in the screenshot you posted in post #13

It doesnt matter. You can extend your os partition to the left using windows disk management.

To extend a partition into unallocated space on the left, in disk management window, rt click the partition and select extend.

To create a new partition in unallocated space, rt click the unallocated space and select new simple volume.

You have got a lot of stuff on your os partition.

I make my os partitions 150-200gb and they are half empty.

You might be better off using some of the unallocated space to create a partition for data and move some stuff off the os partition onto the data partition.

If your os partition is not cluttered with unecessary stuff, it is much quicker and easier for housekeeping such as malware scans, system file check, checkdisk and so on. It also quicker making backup images and in the unlikely event you need to restore the os it also quicker and easier.

Don't fiddle with partitions yet.

Does the PC boot?

I've already commented on your partitions and data.

Don't do anything with the partitions you have. Create a new partition for data.

I think 2 of us have recommended you put personal data in the new partition.
And before making any changes- if it boots, create your first disk image. To do that, download and install the appropriate program, and you'll need a suitable external USB drive to save your image file to.

- as I recommended previously.

If you've never used a partition manager yet, back up first (create disk image of all partitions)
Minitool Partition Wizard is a good free one.