Re: Eraser + SSD
In case of modern PRML disks, these MFM- or RLL-specific passes do nothing special and are completely unnecessary.
Yes. And even back when most folks had MFM or RLL drives, how many of you had data so sensitive that an attacker was likely to crack the case and examine the platters with magnetic-force microscopy?
Most of the "secure erase" modes are just sops for the paranoid. For conventional drives, overwriting sectors once covers all the reasonable branches of the attack tree for nearly everyone. (Obviously that needs to include any sectors that might contain stale copies of sensitive data, if your threat model includes attackers with any real ambition.) You almost certainly don't have any secrets worth the cost of disassembling the drive and scanning the platters, and if you do, there will nearly always be a cheaper way to get them.