Emulation of 1/2" Tape Format for 1/4" Streaming Tape Drives
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
A 1/4" streaming tape drive appears to computer system software to be a 1/2" tape drive by the user of emulation. Functions performed by this emulation include: * Map 1/2" tape Storage I/O Architecture (SIOA) commands into 1/4" tape QIC-II commands. * Map the 1/2" tape file structure into the 1/4" tape file structure. * Map the 1/2" tape label format into the 1/4" tape label format. The following terminology will be used herein: Sector - A 1/4" tape physical block whose length is equal to 512 bytes. VOL - Volume label block (Image Omitted) HDR - System Header label block HDRn - Individual System Header labels UHLn - Individual User Header labels FM - File Mark. A physical file mark that is written on tape.