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 cd-rw, erasing hard drives, degaussing equipment, and degaussing services, see also: media cleaner pro download social security data index how to clean hard drive hard drive wipeout cleaning hard drive platters erase data security data file transfer can magnets erase hard drives erase hidden files data center cleaning degaussing a tv erase computer history erase data on drive erase hard drive nt hard disk data wipe tools military standard how do i completely erase a hard drive home tape eraser clean hard drive free media cleaner pro download data center security partitions computer virus degaussing tools wiping a hard drive macintosh hard drive erase hard disk cleaner data link layer and security hard disk data wipe tools military standard how to erase file without removing it degauss tv cleaning a hard drive computer data network security how to wipe out your hard drive degauser dlt tape degauser bulk audio tape eraser security data paypal free hard drive clean up how to clean your hard drive tv degausser sony trinitron degauss solder degausser 4000

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 cd-rw, degaussers, erasing hard drives, cleaning hard drives, degaussing, and erasing harddrives, see also: