<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><blockquote type="cite"><div>In case anyone is interested I am adding a differencing disk feature that<br>allows you to store only the changes to a virtual disk file, so you can<br>rollback to a known state, or keep the differences from a base image in a<br>smaller file, like undo disks in Virtual PC.<font class="Apple-style-span" color="#000000"><font class="Apple-style-span" color="#144FAE"><br></font></font></div></blockquote><br></div><div>So that I might understand this, what you're offering here is analogous to an (off-line) diffutils (diff and patch, et al) for Windows and that's tailored for big wads of disk data? </div><div><br></div><div>Or is this differencing mechanism implemented at run-time from some known checkpoint where the data is consistent, where you're running some sort of tracing and checkpointing akin to what OpenVMS host-based shadowing and its minicopy or minimerge provides?</div><div><br></div><div>FWIW, with OpenVMS VAX, it's feasible to do this sort of known-starting-state task using a known install image and a real or host-based InfoServer disk service.</div></body></html>