Examples of confidential information typically removed during the disk wiping process include:

The computer's operating system. Licenses are usually non-transferable and may not be legally used by the next owner when the system is resold.

Confidential company information such as payroll, accounting records and customer information.
Private information about individuals such as financial data and health records. The Gramm-Leach-Blilely Act, the health Insurance Portability and Accountability Act (HIPAA), and the European Union data Protection Directive (EUDPD) are just some of the security regulations governing the handling of an individual's non-public personal information or other sensitive data.

The data erasure or "disk wiping" procedures at MemKing IT Asset Recovery are tailored to meet customer requirements:

The "Wipe Disk" application writes over all existing data with several passes of "1" and "0" data bits to meet the Department of Defense "overwrite" standard. Drives wiped in this manner can then be safely resold or re-used.

De-Gaussing of hard drives magnetically disrupts data stored and leaves the drive inoperable.
Physical destruction of hard drives can be performed, if specifically required.