I was concerned that if the netbook was loaned to someone who tried to use the F4 option, I might lose my entire setup. Ideally, one should be able to disable the F4 recovery, or at least the display of the F4 recovery option, in the BIOS. Anyway, I changed the partition type of sda1 from 27 to 17. (I also later tried partition type 83, and this worked same as 17). When the boot F4 option was subsequently used, after several minutes of "Please wait...", it finally said "windows cannot find x:\winclon\manager1.exe", and rebooted when OK was clicked. Although untidy, hopefully this means that F4 recover won't work unless I want it to (by changing the partition type back to 27). Doing things this way at least means that the recovery partition still exists should I decide to return it to factory condition for any reason.