New RN314 3x4TB Question

xeltros wrote:
Depending on the data you had, I would zero-write the old disks at least 7times (US DoD 5220-22M standard according to Apple) or just keep them around as backup (everyone needs a good backup). I think SAS card often accept SATA drives, I often see SAS/SATA on controller description so your card may have SATA ports too.

The idea that multiple overwrite passes increase security is debunked.

If you absolutely want to make sure your data is impossible to read no matter how many billions of dollars are spent trying to read it, then the recommended procedure is degaussing - which destroys the drives, erases the timing tracks, and everything else.

For everyone else, a single but complete overwrite is enough. The NIST recommendations are a better guide on this topic: http://csrc.nist.gov/publications/nistp ... errata.pdf

Using the built in ATA command is ideal, because then the drive firmware itself erases everything. No possibility of something getting overlooked.

If the drive is encrypted (not this case), then all you really need to do is zero the encryption key.