Backup and restore of floopy disk and hard disk
disk scheduling basded on disk arm and rotational position
zip disk， zip disk drive
alignment space generated by metric space
CL-space and almost CL-space
conscious space and virtual space
Hardy space and weak Hardy space
mapping between the operation space and pattern space
mapping from virtual axis space to real axis space
non-commutative space NC space
product space of approximation space
Product space of FC-space
Real space and virtual space