A single sanitization allows you to erase 1 (one) entire hard disk or partition a single time. If the computer has 5 hard disks attached, you need 5 sanitizations. If the computer has 1 hard drive and you want to sanitize it 5 times, you also need 5 sanitizations. Therefore, it is important to know the number of hard disks you want to completely erase and the number of times you want to erase each hard disk.
A single sanitization (wipe) allows you to erase 1 entire hard disk/partition a single time. If you purchase 5 sanitizations, you will be able to erase 5 different hard drives/partitions located on the same computer or on different computers. Or, you can wipe the same hard drive or partition 5 times.