CBL Data Shredder vs Strix Disk Cleaner

CBL Data Shredder is a free utility for erasing hard-drive contents so existing and future software-based recovery tools cannot retrieve them. It overwrites the entire disk with bit patterns, with methods using different numbers of passes. Users can choose a pattern and pass count; the default is one pass of “00”. The program implements a described US Department of Defense 5220.22-M method using three passes with different patterns, and also lists VSITR, Bruce Schneier, Peter Gutmann, and Royal Canadian Mounted Police DSX methods. Its Peter Gutmann implementation makes 35 passes. The Windows version functions exclusively on Windows XP, Vista, 7, 8, and 10. DOS packages are available as a floppy disk maker, a bootable CD-ROM ISO, and a USB flash drive creator; the USB creator requires Windows 7 or later. The free download requires submitting a name and email address, and downloading means agreeing to the licensing conditions. The product warns that modern-drive features may leave some areas inaccessible to the software and vulnerable to hardware-based recovery. Its DSX method alone is not approved for sanitizing classified information, and current standards require physical destruction afterward.

Strix Disk Cleaner is a free tool for permanently wiping whole drives on Windows and Linux. It uses hardware sanitize where possible or multi-pass overwriting, and detects SSDs to recommend hardware sanitization because wear-levelling can make overwriting unreliable. The Windows edition provides a graphical interface and a printable destruction certificate; the Linux edition is a unit-tested command-line eraser. It cannot target individual files: its scope is whole drives. To reduce accidental selection, the system disk and mounted disks are unavailable, and destructive actions require typed confirmation. The tool makes no network calls and requires no account. SHA-256 checksums are published with each release for download verification. Builds are not yet code-signed, so Windows SmartScreen may warn on first run. The Free plan costs nothing and is open-source under the MIT license. The product page links to source code, documentation, and a security guide.