Stacker

File Format
Name	Stacker
Ontology	Electronic File Formats Compression Stacker ; ; ;
Extension(s)	.dsk, others
Released	1990

Stacker is a disk compression software product, developed by Stac Electronics.

Format details

Typically, the compressed volume would be in the form of a file hosted on a non-compressed hard disk. One possible name for the file is stacvol.dsk.

Stacker presumably uses Lempel–Ziv–Stac compression.

More research needed. Compressed volume files apparently start with ASCII "STACKER".