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The same technology that goes into SPX is here: the acclaimed SPX 35-step Gutmann shredding engine. Except this time it ravishes your entire hard drive instead.
If you're in a hurry you can always opt for a 'quick clean', but for those who can only settle for the best, click the 'Weekend' switch. It may take a while, but nothing can protect you better. The SPX shredding engine was the first available for OS X and it's still by far the fastest and the best.*