If you are really concerned, don't lose possession, and either keep the drives and store, or use a huge magnet or sledge hammer. There is govt level secure erase but that goes beyond what Disk Utility offers. New drives can ship with bad, weak sectors and the time it would take to test every sector - and the heat and stress - make it difficult and more trouble.Īn LLF was needed for various reasons but that has been awhile, and did put a lot of stress on a drive.
Quick format only tests the first and last 1M blocks to insure that the partition table can be written and check other variables.
Writing zeroes is rather easy to recover data afterwards. Low Level Format (LLF) was used back with SCSI drives, so not sure why you think that feature would apply.
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