First off ... im really sorry to hear that

its happening alot everywhere lately i guess.
Im not sure what kind of disk lock you had .... but
i use a Xena lock ... the XN15 or the new XX14 is actually the best.
They SCREECH if moved etc .... at 110 decibles
nothing is fool proof, but this definatly helps, i dont
think most would stick around to take something that
makes crazy noise.
a few people in my area are looking into them because there
have been alot of bikes stolen in the last few months.
here's the link for future reference :
http://www.xenasecurity.com/product/...s/alarm/page1/