Look in CONTROL PANEL/ADMINISTRATIVE TOOLS/COMPUTER MANAGEMENT. On the next window, under STORAGE click on disk management. The middle column will show all the drives on the computer. Assuming you can see the drive, sometimes drive letter administration doesn't work correctly and your SSD might want to use drive F (not H) but it is already in use. You can assign a new letter to the SSD. When I do this I usually use letters near the end so it doesn't get overwritten.
Obviously if it is not showing there are other problems.