Capacity of Write-unidirectional Memory in Variable Rate Code Case
符方伟 · Chinese Science Bulletin · 1994
A write-unidirectional memory (WUM)is a binary reusable information storagemedium. During the odd (or even) cycle of updating information, we can only write l’s(or 0’s) in selected bit positions of WUM, and not change other positions. WUM isa mathernatical model of a class of reusable digital discs. The writing constraints aredue to the storage technology of this class of reusable digital discs. During the storingand updating process, the storage speed of writing both 0’s and l’s is much slower