Re: How to erase all data on disks

If you are really concerned about security, there are a number of  
papers and articles you can find in google, but the summary is that  
its pretty hard to securely erase disks.  Bulk erasers often not  
powerful enough.  Software solutions have issues, even with multiple  
overwriting passes.  For example, if the disk has decided to remap  
some sectors during its lifetime, the now-remapped sectors won't get  
overwritten and in theory old data can still be recovered from them.

The gold standard is to physically destroy the drive in a furnace.

In many cases the software overwrite is good enough, but be sure you  
are actually overwriting it.  A quick format or fdisk does not  
actually overwrite any of the data, just the partition table and/or  
file system header.


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