First I wanted to make sure we're talking about using a Non-SSD Hard drive. I know SSD drives work differently.
Here would be a good reference/guide on system encryption: https://www.howtogeek.com/howto/6169/use-truecrypt-to-secure-your-data/
If someone were to encrypt their System partition (Ex. Windows 7 parition) with VeraCrypt or Truecrypt. They would click on **"Encrypt System Partition or Drive" **
There will be a section that asks you "Which Wipe Mode" do you want to use?** You can choose "None" "1 pass" "3 pass" etc.
What is the difference between None and 1 pass, 3 pass etc?
For example, lets say I have a 1TB Non SSD Hard Drive with 1 partition (1TB) (The system partition) with Windows 7.
If I use Truecrypt/Veracrypt to encrypt the system partition with a STRONG PASSWORD that nobody knows. Even if I choose the Wipe Mode "NONE", the entire partition will be encrypted with a STRONG PASSWORD. As long as nobody knows that password, shouldn't nobody be able to access ANY of the information on the hard drive? Even the unencrypted data + free space data PRIOR to doing a system encryption? Is this correct? Or if you choose NONE, can your data prior to encryption be recovered?
If I choose the Wipe Mode "1 pass" or "3 pass", does that just Wipe all the unencrypted data + free space PRIOR to or DURING encrypting the system partition? So, if you have a STRONG PASSWORD, nobody can access the data anyways- Wiped or not wiped? is this correct?
Is this correct? What is the difference between choosing "None" vs "1 pass" or "3 pass" for the Wipe Mode?
(This is probably the most important question)
- Is all my unencrypted data prior to system encryption** (All the unencrypted data on my system partition + free space data) **safe once I've done a System encryption with a STRONG PASSWORD?