If you need software that can erase Macintosh hard disks to military
specifications (that is, writes zeros to every location, then ones to
every location), a product called DiskExpress may meet your need.
DiskExpress is a disk optimizer for fragmented files and can erase unused
blocks. It offers two options to erase unused blocks or the entire volume:
- erase once, writing binary zeros
- erase three times, first writing binary zeros, then binary ones, and
finally binary zeros again.
DiskExpress is AppleShare compatible.
For more information, search the Tech Info Library on ALSoft, the publisher
of DiskExpress.