@ If I concocted a JFdriver that allowed ONE unit only, and subset@ functions (i.e., no controls except what disk gets frag-avoided,< preset limits on sizes used) it might fill the bill, but I'm? worried that some folks might be able to patch the driver image @ and fake around. If the jfctl image had "jfa0:" hardwired in it,8 of course, that'd make such driver patching hard to use.  > Then a demo could be there of this sort along with a full kit.; By using the same drivername with the demo as the full kit, @ you'd have to load either the cut-down JFdriver or the real one,; not both, and if you started using the real kit it might be * unpleasant to go to the limited one again.  = I would have to ensure too that a cut-down jfctl image tested ? that the fake driver was in use. I can do that easily by having ; a different "magic number" in its UCB which I use to ensure ; that it really IS JFdriver. That way, no matter what people > tried, they couldn't do frag avoidance with the real multiunit; driver by assigning jfa2: to jfa0:, say, before running the  control image.  C Actually, the PRODUCT could be modified a bit if we wanted. I could ? fix it pretty easily so that the control image would allow real A frag avoidance on JFA0: regardless (since ucb$w_unit is available @ and can't be faked) of license, but all nonzero units would need" the license or they wouldn't work.  @ Other forms of demo-mode operation are possible, such as testing? for host device name. Allow VDA0: or DCA0: using my vddriver to 4 be frag avoided free, but nothing else, for example.  C I guess I might favor saying you'd need a license to fragavoid more @ than one disk or to control any optional parameters even on thatC one disk. Perhaps also try to say that for free you can't use it on = your system disk (to ensure that one-disk sites can't totally @ get it free)...sys$sysdevice UCB is obtainable fairly reasonablyC and would do. The package runs fine on a system disk - I've used it @ on mine for months - but I don't want to lose all access to thatA part of the market whose disk is ONE (possibly large) system disk ? just because they can get it free otherwise. After all, you can A get 10GB on one drive these days. Someone with one physical drive 9 can still fragavoid one virtual disk. (Maybe FA should be  packaged with virtual disks...) 