Acer TravelMate 7750G - Manual (Page 30)

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Data Protection
Here you can select files for encryption or decryption, and manage your PSD.
Data Removal
Here you can select files to be completely removed from the hard disk. The File
Shredder overwrites the data to make recovering the data impossible.
Note: You can also double-click the File Shredder icon on the
desktop to open this function.
Warning: Make sure you select only the information you want to
shred. Once you have shredded a file or folder, it is impossible to
recover the data.