Debian Format Disk

[Peter Roger <petter_rogers@yahoo.com>]

Hi everyone,

Maybe somebody can help me with some explanations. Thank you in advance!!
When I do format disk form accessories → disk → format disk → erase, I have 3 option:
1. Don't overwrite existing data (Quick)
2. Overwrite existing data with zeroes (Slow)
3. ATA Enhanced Secure Erase (Approximate 4 minutes)

What exactly do each of them?

Thank you!