choose writable folder for each drive for which to overwrite free space?

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what does it mean to "choose writable folder for each drive for which to overwrite free space?" why only one per drive

Also i want to completely delete all files deleted from recycle bin. how do i do this? this prog slows my pc with 11GB ram

The reason it is only one per drive is that each drive has only one pool of free disk space, and BleachBit can clean the free space using any folder on the drive. Said another way, all the folders on each drive share the same free space.

To delete all files from the recycle bin on Windows, check the checkbox Recycle Bin under the System category. If you are using Linux, it is called Trash

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Andrew, lead developer

OK thanks. With me the folder is C:\users\username\app data\local\temp. That is OK?
"To delete all files from the recycle bin on Windows, check the checkbox Recycle Bin under the System category"Is this for file tat are in the recycle or were deleted from it?
And is free space the same as slack space?

Thanks

Yes, that folder is an excellent folder to wipe the free space on the c: drive, which on most computers is the only drive that may need wiped.

No, free space and slack space are different. Free space refers to clusters (typically 4KB on Windows) that are not used for anything. Slack space refers to the unused space within a cluster. When a file requires multiple clusters (which most files do), only the last cluster might have slack space.

Of deleted information, usually most of the interesting and recoverable information in the free space. Of course, this depends on how much security you need: see the documentation Shred files and wipe disks

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Andrew, lead developer