Persistence of data on storage media

by Jamie Riden
Sept. 15, 2017 1 comment Symantec

The problem of sensitive data being leaked through the re-use of storage media is by now well-documented. This is unfortunately a reasonably common occurrence, as shown by various stories of sensitive media being lost or sold ( [1], [2], [3]). However the problem isn't just limited to those files which are left intact when the media is disposed of. To quote Wikipedia: "Slack space or file slack is the area between the end of a file and the end of the last cluster or sector used by that file. This area is simply wasted storage potential, so file systems that use smaller clusters utilize the disk space more effectively." [4]. You will notice this if you have lots of files which are very small; a correspondingly large amount of space on your disk will be wasted. However a greater problem is that some of your data which you thought had been overwritten, is still available to any casual snoopers who come into possession of your storage media. This includes attackers who manage to obtain roo

Steven Ulm 8 months ago

It depends a lot on how you also physically maintain your drive(s). Actually it is a highly-important criteria in my opinion...