HP StoreEver TapeAssure Software - Manual (Page 51)

When to run Run this utility when you want to erase a tape that has been written
previously.
Average duration Quick erase takes about one minute. Full erase takes from 2 to 4 hours.
Secure erase takes between 10 to 25 hours.
Other notes Any data on tape will no longer be accessible after this test.
The test will not run with a tape that has been partitioned.
Available for Ultrium 1 and 2, LTO3, LTO4, LTO5, and LTO6.
Device-specific utilities 51