TPDD client:Disk Power
Disk Power and Disk Power II by Hugu Ferreyra / Ultrasoft Innovations
Disk Power was available for multiple machines. Versions for at least TRS-80 Model 100/102, 200 and Kyotronic KC-85 are known. Versions for NEC PC-8201a and Olivetti M10 are likely but unknown.
The only documentation available about Disk Power is there are many references throughout the M100SIG Archive.
Few/no copies are available today as it was designed to be impossible for the user to copy.
Both the distribution disk and the cassette were required to install the software. There is no way to prevent copying a cassette, but the distribution disk was impossible to copy using any of the TPDD software available at the time. This includes the full-disk backup utility on the original Tandy TPDD utility disk, and DiskPower itself provides no backup utility.
So, to install, or re-install the software after a crash or full power loss or a cold reset, the user needed both the cassette and the actual original distribution disk.
Today there is a tpdd utility that can read & write TPDD1 and TPDD2 disks more completely than what was previously available. If any physical copies of Disk Power turn up, it will now be possible to archive and redistribute it. This has been done for the KC-85 version.