OK, so it's NOT a 400 GB drive. Presumably its disk-space capacity would be about 447 GB. Well as long as the total contents on the 2 TB source boot drive are less than then about 440 GB there should be no problem to clone the contents of your boot drive to that SSD.
1. Now we're assuming certain criteria has been met, to wit...your present 2 TB boot drive boots & functions without ANY problems, right?
2. The SSD is non-defective.
3. You've properly installed the SSD in your system.
4. You've properly used the disk-cloning program - in your case the EaseUS Todo program.
(That last criteria is the source of many failed disk-cloning operations we've found in our experience!)
If you want to try a different disk-cloning program, one we use all the time & highly recommend, here are some instructions for doing so...
The program is called Casper that we've used for many years and it's an easy-to-use program and quite effective. While the program is a commercial one costing $49.99, a 30-day Trial Version is available that you can use. You can download this version from https://www.fssdev.com/products/casper/trial/
1. After installing the program and before undertaking the disk-cloning operation close all open programs. (Generally you need not disable your anti-virus program). Ensure your destination drive - the proposed recipient of the clone, your SSD - is properly connected in the system.
2. The opening screen of the program will highlight "Create a Bootable Backup". Click on "Add drive" and a listing of the appropriate destination drive(s) will appear, i. e., your 480 GB SSD.
3. Click on your destination drive's listing, i.e., the SSD, and then the "Back up now" button.
4. Casper will run in the background and alert you when the disk-cloning operation is completed. (You can view the actual progress chart by clicking on the Casper icon in the Notification Area on the Taskbar.)
5. THIS IS IMPORTANT. Following the (hopefully!) successful disk-cloning operation disconnect (when practicable) the source 2 TB HDD from the system and boot SOLELY to the connected destination drive, your SSD. NO OTHER DRIVES SHOULD BE CONNECTED IF POSSIBLE. As a general proposition it's a good idea (whenever practicable) for the newly-cloned drive to be connected to the motherboard's first SATA data connector, usually designated SATA 0 or SATA 1.
Also, check the system's BIOS/UEFI to ensure the cloned drive is now first in boot priority order.
6. Work with the newly-cloned SSD for a while to determine it boots & properly functions before reinstalling the HDD which will now serve as a secondary drive in your system. Don't rush it. Work with the SSD for a day or so to ensure it's properly booting & functioning.
7. Ordinarily Casper will utilize the entire disk-space of the destination drive to contain the data contents from the source drive. In some cases the program will create a partition on the destination drive (your SSD) only to the extent of the total data cloned. If that does happen, you can use Disk Management to extend the partition to encompass the total disk-space available on the SSD; it's a simple operation.
7. Finally reinstall your 2 TB HDD which will serve as a secondary drive in your system for storage, backups, or for any other purposes you desire.
Let us know how it goes, OK?
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