No, boot0 is just a normal file that is 512 bytes long. There is nothing special about it. In it is a bootloader program that can be used to boot FreeBSD, and if you run it during boot, it will read the partition table and look for all OSes. I think it will modify the partition table, though, marking the last OS you booted into, but that's the program running doing that, the file itself is harmless.
Ok. I must have used some other command then, which resulted in my first disk MBR getting over-written ... strange. :-/
By the way, does the fact that NTLDR is on my first disk, while FreeBSD (and hence its MBR boot0) is on my second disk complicate matters? I mean, you mention boot0 will modify my partition table to reflect which OS was booted last -- will it by any chance modify the partition table on the first disk and hence mess it?
Yes and yes, http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#NT-BOOTLOADER
Regards,
Mark
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