| Subject | English | Arabic |
| comp., MS | Space Bitmap Descriptor | واصف الصور النقطية المتباعدة (A bitmap describing the utilization of blocks allocated to a metadata partition) |
| comp., MS | volume bitmap | صورة وحدة التخزين (A stored reference (which may exist both on hierarchical directory volumes and in memory) to every piece of data that is in the allocation blocks and indicates whether the block is allocated or free for use) |