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 ntfs hard drive free, erasing hard drives, degaussing equipment, and degaussing services, see also: hd-1 professional hard drive degausser v-94 gsa schedule v-860 tape eraser cleaning out a full hard drive cds1500 tape eraser erase hard drive mircrosoft installing windows xp on a clean hard drive v-860 degausser steps for cleaning data in a data warehouse sv91m disk eraser plasmom optical media cleaners surface sv91m disk eraser v-890 video tape degausser healthy climate air cleaner media how to delete my hard drive how to erase files on hard drive visual basic recordset mshflexgrid erases row data erase data from hard drives how can you erase data from a cd-r td1b tape degausser mds5 eraser v-94 gsa schedule destroy hard drive data per-1100 drive degausser v-870 video tape degausser hard drive dod wipe v-880 eraser erase hard drive utility basic instructions on how to delete a hard drive partition v92 hard drive eraser v-860 gsa schedule sv91m hard drive degausser tv degauss wand cleaning data in a data warehouse v-890 tape eraser hard drive dod wipe per-4516 tape degausser hard drive clean up reviews mds5 eraser sv91m diskette degausser

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 ntfs hard drive free, degaussers, erasing hard drives, cleaning hard drives, degaussing, and erasing harddrives, see also: