PGP Shred Free Space allows you to erase free disk space that could contain data from previously deleted files and programs. It is especially important to use the PGP Shred Free Space Assistant on Journaling file systems such as NTFS, as such file systems make a second copy of everything written to disk in a file system journal. This allows you to destroy sensitive files or folders completely.
To use the PGP Shred Free Space Assistant
Open PGP Desktop.
Select PGP Disk > PGP Shred Free Space. The Introduction screen of the PGP Shred Free Space Assistant is displayed.
Read the information, then click Next.
In the Shred drive field, select the disk or volume you want to shred and the number of passes you want PGP Shred Free Space to perform. While three passes with PGP Shred are sufficient to securely delete the data, you can specify up to 49 passes. The recommended guidelines for number of passes are:
3 passes for personal use.
10 passes for commercial use.
18 passes for military use.
26 passes for maximum security
Choose whether to shred internal NTFS data structures. This option is not available on all systems.
Caution: If the selected partition is not your boot partition, you can perform an intensive shred operation that overwrites internal NTFS data structures that may hold residual data. The partition will be completely filled during this process, and as such you should not use the disk for anything else while the free space shred operation is in progress.
Some of these structures are not generally considered free space on your drive, but the techniques employed by this option will cause them to be shredded. This option does not increase the risk of anything negative happening to your disk as a result of the shredding operation.
Click Next. The Perform Shred dialog box is displayed, containing statistical information about the drive or volume you selected.
Click Begin Shred.
After PGP Shred Free Space completes, click Next.
Imported Document ID: TECH149790
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