Originally Posted by Rita G.
Is it necessary to zero-write a hard drive between operating system installations?
no, that's totally unnecessary. You can just re-partition it, re-format the partitions and install a new OS without wiping the disk before. Completely wiping a disk may be a good idea, however, if you hand it over to somebody else, and you want to make sure you don't accidentally pass any personal, private data that could be recovered.
[X] Doc CPU