An alternating current (AC) bulk eraser (degausser) is used for complete erasure of data and other signals on magnetic media. Degaussing is a process where magnetic media is exposed to a powerful, alternating magnetic field. Degaussing removes any previously written data, leaving the media in a magnetically randomized (blank) state.

The degausser must subject the media to an alternating magnetic field of sufficient intensity to saturate the media and then by slowly withdrawing or reducing the field, the magnetic media is left in a magnetically neutral state.

To erase recorded data, it is necessary for the strength of the degaussing field to be greater in value than the coercivity of the magnetic media. Simply stated, coercivity is the magnetic field strength, rated in oersteds (Oe), required to change the magnetic orientation of the magnetic material. Check with knowledgeable dealers or degausser manufacturers to identify degausser models that meet your requirements.

Data is typically not lost until its level has been decreased 65% to 75% (or more) below its original saturation recording signal level, dependent upon the drive system.

 

For more information on erase hard drive computer free, erasing hard drives, degaussing equipment, and degaussing services, see also: erase index.dat files info about data security expo dry erase cleaner material safety data sheet free hard drive wipe free hard drive clean bulk audio tape eraser delete from data adapter erase access denied files homemade tv degausser free hard drive clean destroy data and hard drive and emergency degauss coil wand degauss coil wand how do i completely erase a hard drive definition of data cleaning thompson financial security data hard drive clean sweep clean a hard drive erase free space on hard drive computer virus erases data on hard drive driver to erase rewrite cd free hard drive clean download degauss coil wand free hard drive clean wipe the hard drive r.s. andrews high efficiency media retrofit air cleaner clean hard drives free hard drive wipe delete hard drive to reinstall windows 98se hard drive scrub porn delete partitions on hard drive computer virus erases data on hard drive wipe the hard drive cleaning up hard drive completely wipe hard drive free what can i do to clean up my hard drive car;isle degausser 4000 clean program from hard drive completely degaussing facilities how to wipeout a hard drive

A complete erasure level, for most users, is considered to be 60 dB below the original signal level – this of course depends on user requirements. A 60 dB signal decrease equates to reducing the signal to one tenth of one percent of its original value.

Magnetic media products that have factory prerecorded magnetic servo patterns should not be degaussed. Degaussing would erase the factory written magnetic servo signals and leave the media unusable. For all other magnetic media (without magnetic servo signals), after proper degaussing, the quality of subsequent data recording should be unchanged or even improved.

It is very important to understand and follow the degausser’s operating instructions. This is especially important for manual units where the operator controls the media’s movement through the degaussing field. For higher coercivity media, four passes are often recommended – two passes, with a 90 degree rotation for the second pass, and then repeat the process with the media turned upside-down. Of course, these and other important operating considerations will vary with the type, power and construction of the individual degausser models.

For more information on erase hard drive computer free, degaussers, erasing hard drives, cleaning hard drives, degaussing, and erasing harddrives, see also: