Traditional disk wipers are often stuck in bad sectors
leaving no time to sanitize data on healthy area of
the disk, or just skip them leaving sensitive
information around bad sectors not erased. WBD(Wipe
Bad Disk) can thoroughly wipe disks with bad sectors
in a hierarchical and elegant way. Even the disk has
no bad sectors, you can also take advantage of the
WBD's unique wiping algorithm to gain high security
degree in a short time. WBD wipes the disk through 3
stages(stage 0-stage 2), 16 passes, and multiple
levels, resulting in a new security-degree to time-
cost relationship(see the figure below) in contrast to
the linear functional relationship of traditional disk
shredding software. This means if you can not wait the
wiping process to complete and stop it earlier, you
can gain higher security degree than conventional disk
wipers costing the same amount of time.

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