Hi, You might be able to clear the GLIST with the Hdderase utility but only if the drive supports the 'enhanced security erase function'.
From the readme.......
Quote:
Q: What is the difference between secure erase and enhanced secure erase?
A: Secure erase overwrites all user data areas with binary zeroes. Enhanced
secure erase writes predetermined data patterns (set by the manufacturer) to
all user data areas, including sectors that are no longer in use due to
reallocation. ***NOTE: the enhanced secure erase option is not supported by
all ATA drives.