How overrite HD system 7.5

I've kept a PPC with system 7.5.1 around for reference to prior financial records.
Now chose to wipe it clean, along with 3 external HDs.
Erased internal disc, then erased three external discs.
Maybe that is enough, but I recall that if financial and personal data is on a drive, the only way to insure it is not accessible is to overwrite the drive.
How can that be done with 7.5.1???
What I did do is use Silver Lining to also erase the HD and THEN set a password to both start and open the drives.
Will that suffice? or what??

Wow, 7.5.1 !
Did Silver Lining write zeros to the drive?
OS X 10.1 and System 7.5 – OS 9
Since OS X 10.1 wasn’t really as complete as 10.2 (Jaguar), the Zero all data function isn’t present. Fortunately, we have the option of booting into OS 9 which does support this. If you have a system thats at least System 7.5 up to OS 9, follow these instructions.
1. Boot from the System 7.5 up to OS 9 CD that came with the computer.
2. Choose Drive Setup from the Utilities folder
3. Choose the Functions option and then Initialization Options.
4. Choose the Zero all data option.
5. When finished, for a more secure erase, repeat this process at least three times.
Shredit...
http://www.mireth.com/wt/si7e-erase-hard-drive-mac.html

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