6 ms·

> dd if=/dev/zero it or `shred` it. Probably takes longer but more secure.

• wang_li 5y ago
  /dev/zero is perfectly fine for modern high density drives. If the drive in question is MFM or RLL from the '80s or '90s, then absolutely go bananas with 53 different bit patterns. But otherwise zeros is effective for nay hard drive made in the last decade. SSD has issues with wear leveling, so good luck wiping those. Though you're only going to have to worry about someone who is willing to disassemble the SSD device and read the chips individually.