An open source utility for Windows (32 and 64 bit) that will securely erase files and directories on a Windows machine, in addition to scrubbing free space and OS-related temporary files that could leak information. It can even wipe an entire system if you need it.
A freeware utility which clones most any hard drive block by block to another device. Possibly crypto agnostic.
An excellent wiki tutorial on how LVM (logical volume management) for Linux works, how to set it up, and how to manipulate it.
An archive of free-to-download and use disk images for practicing your data forensics fu or testing file carving tools.
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