Option Description
Secure Erase
(SSD only)
The ATA Secure Erase command instructs the drive to reset
all available blocks to the erase state. How the erase state is
implemented on the drive is not mandated by the ATA
specification, which means the final data state on drives is
manufacturer dependent (and not necessarily all zeros). For
drives that do not support Secure Erase, TD4 will indicate
this limitation during wipe type selection.
Due to the indeterminate nature of the post-wipe data state,
TD4 does not offer verification for Secure Erase wipes.
Due to known issues with inconsistent and unreliable Secure
Erase support on rotating drives (HDDs), TD4 only supports
this feature on SSDs.
Note that Secure Erase will erase all accessible drive space,
but it will not necessarily erase over-provisioned space or
other space reserved by the drive's internal controller.
TD4 will force removal of any detected HPA/DCO/AMA
configurations prior to starting a Secure Erase wipe.
Sanitize - Block Erase
(SSD only)
The ATA and SCSI Sanitize ‒ Block Erase commands instruct
the drive to erase all flash memory blocks. This is typically
done electrically, not through writing of data to the drive.
While the state of post-wipe data is not mandated by the
ATA/SCSI specifications, Sanitize ‒ Block Erase typically
leaves a drive in a cleared (all zeros) state, which allows for
post-wipe verification. For drives that do not support
Sanitize – Block Erase, TD4 will indicate this limitation
during wipe type selection.
Note that Sanitize ‒ Block Erase will erase all user accessible
drive space as well as over-provisioned space and any other
space reserved by the drive's internal controller.
TD4 will force removal of any detected HPA/DCO/AMA
configurations prior to starting a Sanitize ‒ Block Erase wipe.
Sanitize ‒ Overwrite The ATA and SCSI Sanitize ‒ Overwrite command instructs
the drive to overwrite all drive data in both storage and on-
drive cache with zeros. This feature is typically implemented
on HDDs but is available on some SSDs. For drives that do
not support Sanitize – Overwrite, TD4 will indicate this
limitation during wipe type selection.
Note that, for SSDs that support Sanitize ‒ Overwrite, in
addition to all user-accessible drive space, over-provisioned
space and other space reserved by the drive's internal
controller will also be erased.
TD4 will force removal of any detected HPA/DCO/AMA
configurations prior to starting a Sanitize ‒ Overwrite wipe.
4.6. Viewing sources and destinations
ISTD230100-UGD-EN-1
User Guide
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