OK, I've got it to the point where is makes _a_ filesystem, and now I'm off to bed. The image looks fine to me, but I thought I'd pass the source code around in case someone spots an incorrect assumption that I've made, or a bug. I have created an RK03 image using the V1 binaries off the s2 tape. I then ran V1 check on the image; here is what it said: # check rk.img 0 files 0 large 0 indirect 0 used 3420 free Not exactly fantastic, but much better than when I gave check a random file to digest :) Good night! Warren P.S cc -o mkfs -Wall mkfs.c