I'm selling a 4-year-old Dell PC with Windows 10 and two SSDs and I want to be sure that nobody can recover anything from my personal deleted files. So far I've done the following.
- Completely Bitlocker encrypt both disks, including unused space. (Note the machine did not have TPM so I had to use a password)
- Uninstalled software and deleted all personal files. (For sake of discussion, let's assume I didn't miss any personal files.)
- Created a new, Administrator-level account
- Logged on to the new account.
- Completely deleted my previous user account.
- Completely Bitlocker DE-crypted both disks again
- Completely bitlocker encrypted and then decrypted both disks, yet again.
My idea was that if Bitlocker full-disk encryption/decryption really touches the whole disk, then two rounds of encrypt/decrypt out to overwrite everything. But I don't know if I understandit correctly or even if SSDs truly work like HDDs in that regard
Is this good enough? Is there some other step I can take that doesn't involve buying some expensive tool?
I can't sell this encrypted and I want to leave Windows 10 on there so I didn't want to completely reformat the system drive.