Hi Barb, & Welcome to Tom's Hardwre!
I don't find a Freecom set of tools that might have a secure erase included, like Seagate Seatools or WD Lifeguard tools.
Couple ways to securely erase a HDD that you could use.
CCleaner, a very good and well respected free utility has an appl called Driver Wiper under "Tools". You can wipe the whole disk with with 3, 7, or 35 passes (3 should be fine - 7 if you are compulsive - 35 if you work for the NSA!) to make sure nothing is retrievable from the disk. Make sure you choose ONLY the disk you want to wipe clean from the menu.
If you want to have the disk just like it came from the factory, you could the Windows CommandLine Interpreter called Diskpart. It is much techier, done from the command line, and you have to make sure you are wiping that specific disk, not one of your attached disks.
to use it, you go to Accessories, right click on CMD, choose RunAs Administrator.
Type DiskPart
Type List Disk - it will list all the attached disks and each will have a number. Pick the number of the disk you want to wipe clean
Type Select Disk (that number) (like Select Disk 3) - that disk will have the focus
Type Clean All - that will clean the disk with the focus, all the disk sectors, and set all bytes to 0.
When done, Type Exit - done, and you are out of the DiskPart interpreter.