Curb is a utility for Mac OS X that guarantees a permanent solution to permanently delete files you have stored in a pendrive or memory card, which natively does not happen this way because the files remain on the drive until you delete them manually.
Curb What does for us is to facilitate the removal of those files, for which only have to drag the drive icon to the Curb (represented by a green oval and the application will rule forever and deleted files , which makes writing in these occupied sector.
Forms of work are varied, from a deletion of a single pass to other of 7 passes or 35 passes (Gutmann algorithm) in all cases, eliminating any possibility that someone can then retrieve them through some utility.
Curb is compatible with Mac OS X 10.5 and higher, and since it is AVAILABLE in universal binary format is compatible with Intel-based Macs and also with the older PowerPC.