
 Virtual Disks A VDdriver for alpha VMS (vdd64.zip) or Vax VMS (vddriver-vax.zip). 2 Treats a contiguous block range or file as a disk.   Fragmentation Avoider A NOTE: For VMS 7.2, the zmenu utility seems not to work with these ? images. Look for zmenu.zip elsewhere on this sigtape (thanks to 
 Dick Munroe).     D This frag avoider will prevent most fragmentation by causing extendsA to be a fraction (default 1/4) of the current filesize. It can be D used on any disks, and this version (finally) contains the necessaryB invalidate_tb for vax or IMB for Alpha to allow it to be installed@ even on active disks without hanging anything. Originally it was designed to be loaded at boot.     Build:   Alpha:  # $macro/migr/obj=jfdriver jfdriverv2  $macro/migr/obj=jfctl jfctlv2  $@jfdriver.lnk6 $link/native/bpage=14/sysexe=select/exe=jfctl.exe jfct   Vax: $macro/obj=jfdriver jfdriverv2 $macro/obj=jfctl jfctlv2) $link/notrace/exe=jfdriver.exe jfdriver+- %  sys$system:sys.stb/sel+sys$input/opt  base=0 $!  : $link/exe=jfctl jfctl+sys$system:sys.stb/sel+sys$input/opt sys$share:vaxcrtl/share  $!  B Copy jfdriver.exe, jfctl.cld, favoid.cld, jfctl.exe to sys$system.5 (Also copy zmenu.exe, zmenu_Scroll.exe to sys$system, : or copy zmenu*.exe_A2 to sys$system:*.exe on alpha if you . want to use fa_Setup.com to set the thing up.)   Use:  
 In startup  7 $ sysman io conn jfa0:/noada/driver=sys$system:jfdriver 7 $ sysman io conn jfa1:/noada/driver=sys$system:jfdriver  ... % for as many units as you want. On vax   3 $sysgen conn jfa0:/noada/driver=sys$system:jfdriver ( $sysgen conn jfa1:/noada/driver=jfdriver( $sysgen conn jfa2:/noada/driver=jfdriver ...      To use then:   $set comm sys$system:favoid  $favoid jfa0: dka0:  $favoid jfa1: dka200:  $favoid jfa2: dkb400:   < or whatever. Some switches can be used; read the .cld files.? You can also disconnect jfdriver if you want. One jfdriver unit ) goes with one disk. Do not double assign.   3 This version can be started even on an active disk.   : Preexisting object files are not guaranteed; best re-macro! from source for your VMS version.  Glenn Everhart  