LTO degaussers such as the V91 DLT/LTO alter the magnetic charge on LTO tape cartridges. This process will erase the data stored on the tape and also erases the cartridge’s servo tracks, making the cartridge completely unreadable. Note: Some backup tapes may not be reusable after degaussing due to the servo track being erased.
For Erasing Cassettes and Cartridges the operator turns the security key on the front of the V91 DLT/LTO to the “On” position. Pressing the red “Power” button turns on the magnetic field. The operator then takes the media and passes it across the middle of the top surface on the V91 DLT/LTO from one side to the other in one slow and smooth motion. Turn the media through 90° and repeat the motion. Flip over the media and subject it to a third pass, turn 90° and do a fourth and final pass.
The media is now erased and ready for reuse if required.