Before revision: Description The system stored memos using helical scanning on special microcassettes, which were 30 × 21.5 × 5 mm with a tape width of 2.5 mm, with a recording capacity of up to 120 minutes .
After revision: Description The system stored memos using helical scanwas an R-DAT based system whichsimilar to Digital Audio Tape on special microcassettes, which were 30 × 21.5 × 5 mm with a tape width of 2.5 mm, with a recording capacity of up to 120 minutes .