1. When are the boot blocks copied to a new hard disk or floppy?
The boot blocks are copied to a new hard disk or floppy disk when you copy a System file to the disk.
2. Are the boot blocks taken from the "boot" resource in the System file being copied or from the boot blocks on the source disk?
The boot blocks are taken from the source disk unless that disk does not have a valid copy of the boot blocks or the disk is a file server. In these cases, the boot blocks are taken from the "boot" resource in the System file being copied.
3. Are the boot blocks rewritten when copying a new System and Finder to a System disk?
Yes, the boot blocks are rewritten when copying a new System file to a disk.