Lenovo IdeaPad U550 - Manual (Page 136)

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Appendix E. Notices
• Format your hard disk, using the software for initializing it.
• Using the preinstalled recovery program, bring the hard disk back to
factory-ship state.
These operations, however, only change the file allocation of the data; they
do not delete the data itself. In other words, the data retrieval processing is
disabled under an operating system such as Windows. The data is still
there, even though it seems to be lost. Thus, it is sometimes possible to read
the data by use of special software for data recovery. There is a risk that
people of bad faith may read and misuse the critical data on hard disks for
unexpected purposes.
To prevent the leakage of data, it becomes very important that you take
responsibility for deleting all the data from the hard disk when you dispose
of, sell, or hand over your computer. You can destroy the data physically by
smashing the hard disk with a hammer, or magnetically by means of strong
magnetic power, thus making the data unreadable. But we recommend that
you make use of the software (payware) or service (pay service) specifically
developed for the purpose.