3 isn't that many operating systems to have installed.  I could see
installing at least 3 or 4, if I weren't trying to be a mathematician.
(^&  (As-is, I just have one OS installed---well, I have a GNU/LINUX
(Debian) OS set up as a secondary boot partition on one system...but I
haven't booted it with any frequency since setting it up.)


(Side note: I find it amusing that that GNU/LINUX OS _forces_ a fsck if
it's been ``too long'' since one was last done.  Apparently, the people
developing that GNU/LINUX don't have much confidence in their filesystem
support...(^&  That, or they have unclean shutdowns, universally, on a
frequent enough basis that no one runs cleanly long enough to encounter
the spurious fsck.)


  ``I probably don't know what I'm talking about.'' --rauch@math.rice.edu