Spring 1997 Things CMPHIGHC.ZIP This is a compressing virtual disk system. It will let you make a compressed image of a disk (putting it on two files, a short index file and a longer data file) and access this disk as an exact copy of the original. Great for saving archival information in 1/2 to 1/3 the normal space. Large amounts of internal cache make it a good performer. The virtual disk you get is read-only (junks write attempts) but takes much less room than a full disk. The program can access container files even across DECnet, so providing another way to share information across a net. Complete sources are present. The system will store data "as is" if it does not save any space when compressed, so compressed disks cannot be significantly larger than original even if every bit of the original is compressed. Generally space savings run 50-75%. You make a compressed image with the cmpdskh program and access it through dthstimg and dtdriver. The package can also be used to present HSC backup or backup/physical savesets residing on tape directly as virtual disks to VMS. This capability has been used with the VMS block server to allow backups of block server containers to be made available to Windows NT as virtual disks, directly from tape without the need to restore the backups to disk first. FQDRIVERNEW.MAR;2 This driver is a variant of my old fddriver, a driver that is used for remote disk, disk on file, etc. FQDRIVER_VMS_71_VAX_LINK.HOW;1 The linking instructions for VMS VAX 7.1 tell how to link fqdriver (and also fddriver and others) on VMS VAX 7.1 to get them to work. Some linker changes make it necessary to link slightly differently than older VMS versions to get all the driver into memory. FRAGMENTATION_AVOID.ZIP;1 This is an update to the fragmentation avoider I wrote for Acorn Software (which was released with their permission). Its I/O intercept code has been altered (see jfdriverv2.mar and jfctlv2.mar) so it will interoperate with the upcoming VMS multipath switching code. I/O intercepts will need to use this scheme to be compatible with multipath switching, or it will break, or they will break. JFCTLV2.MAR;5 JFDRIVERV2.MAR;7 VDDRIVER_ALPHA.ZIP;1 Update to vddriver for alpha VMS...this one is still the one that works with DEC volume shadowing. Glenn C. Everhart