SST was an "all in memory" hard disk optimizer designed to defragment early
PC hard disks. It was typically run on a system with a hard disk no bigger
than 10mb or 20mb (remember that?).
SST was marketed very successfully as a shareware product in 1985 and 1986, which led to its technology eventually being incorporated into the commercial hard disk optimizer DS-Optimize in 1987.
Hard disk optimizers are not generally included with modern operating systems, and SST was never designed to run on todays hard disks, typically 500,000 times as large.
While the program is very obsolete, we are not aware of source code for any other PC hard disk optimizer ever being released into the public domain. Hopefully, someone will find it interesting.
The Turbo Pascal source code to SST is now committed to the public domain.