VD Driver
These drivers (vdd64.zip for alpha, vddriver-vax for vax) implement
virtual disks on contiguous files (or chunks of disk blocks). They are
comparatively fast and can be used e.g. for containers for use
burning CDs or for making compressed virtual disks with cmphighc on
this area.

Fragmentation Avoider

This frag avoider will prevent most fragmentation by causing extends
to be a fraction (default 1/4) of the current filesize. This will
also speed writing greatly in almost all cases.


Build:

You can try using kitinstal to instal fav020.a; I THINK that the
install will work. For VMS V7.2 and up you need to get zmenu off
the [.vu] area of this disk and build that. Otherwise follow the
below:

Alpha:

$macro/migr/obj=jfdriver jfdriverv2
$macro/migr/obj=jfctl jfctlv2
$@jfdriver.lnk
$link/native/bpage=14/sysexe=select/exe=jfctl.exe jfct

Vax:
$macro jfdriver
$macro jfctl
$link/notrace/exe=jfdriver.exe jfdriver+-
 sys$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
$!

Copy jfdriver.exe, jfctl.cld, favoid.cld, jfctl.exe to sys$system.
(Also copy zmenu.exe, zmenu_Scroll.exe to sys$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

$ sysman io conn jfa0:/noada/driver=sys$system:jfdriver
$ sysman io conn jfa1:/noada/driver=sys$system:jfdriver
...
for as many units as you want. On vax

$sysgen conn jfa0:/noada/driver=sys$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.

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


Also present is cmphighc.zip which gives compressing readonly
virtual disks made from normal disks. Use to store archival stuff
in always-ready form in 1/3 or maybe less of the normal space.
(Using it, 4 VMS listing CDs, complete, fit on a single CD drive
and can all be effectively mounted at once.)