Question: I’m getting an SSD for this pc build, obviously im using it to install windows, but after that I need a hard drive for storage. Luckily, I do have this 1 TB hard drive in my prebuilt, and I was wondering if it’s safe it reuse after resetting the pc and removing everything.

Answer:

I’m getting an SSD for this pc build, obviously im using it to install windows, but after that I need a hard drive for storage. Luckily, I do have this 1 TB hard drive in my prebuilt, and I was wondering if it’s safe it reuse after resetting the pc and removing everything.

You can’t “reset” to a new drive.
That will be a full fresh install on this SSD.

During that “reset and remove everything”, you can’t choose which drive to apply it to.

So, you do the install with only the SSD connected.
Later, you reconnect the HDD and you can wipe it clean of ALL data.

How To – Windows 10 clean install tutorialWindows 10 Clean install tutorial This tutorial is intended to help you, step by step, to perform a clean install of Windows version 10, build 1709 or newer but can be equally applied to earlier installer versions which may simply lack some of the Cortana assisted settings screens but should…forums.tomshardware.com

For the HDD, commandline function diskpart, and the clean command will wipe everything on it.
https://www.tomshardware.com/news/format-hard-drive-command-prompt,37632.html
How to Diskpart Erase/Clean a Drive Through the Command Prompt | Seagate Support USThis article explains the Microsoft Diskpart Erase utility. The command that erases the drive during this process iswww.seagate.com