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How to wipe disk free space on a hard drive
on Mac OS X using ShredIt X
Use this procedure to shred the disk free space on a hard drive.
- Disk free space is the area on your hard drive containing de-allocated memory. This is where all the data you have previously deleted is stored, until it is overwritten by something else.
- To shred the data you have previously deleted, you need to shred disk free space. If you have a lot of disk free space or a slow hard drive, shredding free space can take a while.
- Once you have shredded the data you have previously deleted, all your confidential trash has been securely disposed of. After that, to ensure that all future confidential documents are securely deleted, drag them to ShredIt shredder, not to the Trash icon. (See: How to shred a file) If you accidentally put a confidential document into the trash, and empty the trash, then you need to shred the free space again to securely delete it.
- If you shred the free space on a disk by mistake, don't panic. Using this procedure will only shred your free space, not your data. We've made it easy to shred the free space of a disk and more difficult to shred the contents of a disk. This is intentional, so that you don't accidentally shred the contents of a disk (i.e. your data).
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Requirements
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Instructions
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There are three ways to erase the free space on a disk using ShredIt X.
Drag the hard drive onto the ShredIt X Icon and drop it

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Double-click the ShredIt X Icon to start the program. Click the "Shred Free space" button on the main dialog. From the pop-up menu, pick the drive you want to erase the freespace of.

or
Double-click the ShredIt X Icon to start the program, and then pick the disk you want to shred the free space of using the “FreeSpace” Menu . (ShredIt X>Freespace>[Hard Drive Name])

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Notes
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- For more detailed information about ShredIt X for Mac OS X, refer to the
- Tutorials are available for other versions of ShredIt
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