SendPackack is a simple program that sends IO$_PACKACK to
an arbitrary device. Use it where you want to, for example,
access disks with packages like vddriver without actually
mounting them. The packack action will cause disks to become ready
if the underlying drivers can support them.

VDdriver - definitive versions of vddriver for vax and alpha
VMS. VDdriver emulates a disk using a contiguous file or section
of blocks on a real disk. The versions here have the necessary
hack to get them to work with DEC volume shadowing also.

ZRGK2048HOST -"host process" for zrdriver (see older sigtapes)
which has io$_diagnose code to allow it to talk to 2048 byte
block devices. Written for use with CDs that don't have 512
byte blocks.
  (zrdisk.zip is present to supply zrdriver for those not having it.)