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4 preview, 5 clean-up progress, 3 hard disk wiping methods – Acronis True Image 2015 - User Guide User Manual

Page 133: Hard disk wiping methods

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Click Show network places to view the list of network places that you visited using the credentials
you want to delete.

8.5.2.4

Preview

When the scanning is finished, its results will be available in the upper part of the wizard window. By
default, all system components are scanned for clean-up. If you want to customize which of the
system components should be scanned and which should not, change the default clean-up settings.

You can view the search results and manually select/unselect the items you wish to clean up/keep. In
order to help you with making the right choice, all the components are provided with brief
descriptions. Just click on the component's name and its description will be displayed in the right side
of the window.

To select/unselect a component

Expand the System Components item in the System Clean-up tree and make sure that the
component you wish to clean up is selected. If you do not want to clean up a component, simply
clear its check box.

If required, you can dig deeper by expanding a component and selecting/unselecting its contents.

Having specified the components for clean-up, click the Clean-up button to continue.

Windows Vista and Windows 7 do not keep information on file and computer searches. Furthermore,
information on opened/saved files is stored in the registry differently, so the wizard shows this information in a
different way.

8.5.2.5

Clean-up progress

The operation status window reports about the state of the current operation.

The progress bar indicates the level of completion of the selected operation.

In some cases, the operation may take a long time to be completed. If this is the case, select the
Shutdown the computer after completion check box. When the operation finishes, Acronis True
Image 2015 will turn the computer off.

8.5.3 Hard Disk Wiping methods

What is the problem?

Information removed from a hard disk drive by non-secure means (for example, by simple Windows
delete) can easily be recovered. Utilizing specialized equipment, it is possible to recover even
repeatedly overwritten information.

Leakage mechanism

Data is stored on a hard disk as a binary sequence of 1 and 0 (ones and zeros), represented by
differently magnetized parts of a disk.

Generally speaking, a 1 written to a hard disk is read as 1 by its controller, and 0 is read as 0.
However, if you write 1 over 0, the result is conditionally 0.95 and vice versa – if 1 is written over 1
the result is 1.05. These differences are irrelevant for the controller. However, using special
equipment, one can easily read the «underlying» sequence of 1's and 0's.