I've recently rebuilt my 10gig MkIIa.

The harddisk builder utility only took about 10-15 secs before it started it's stress test.

I also found it was very quick. I actually used the HD utility twice because I couldn't believe it could be that fast, and I hadn't paid any notice to the things hyperterminal showed whilst performing the format. (I know I can scrollback in hypertrm, but I figured I'd redo the whole process anyway). The second time it was just as fast, but I guessed it was allright since hyperterm didn't show any errors.

I was right. All went fine from there.