Source: wikibot/free-space-bitmap
= Free-space bitmap
{wiki=Free-space_bitmap}
A **Free-space bitmap**, often referred to as a **free block bitmap** or **free-space management bitmap**, is a data structure used in file systems to keep track of the available (free) blocks or space within a storage medium (such as a hard drive, SSD, or any other type of storage). The purpose of this bitmap is to efficiently manage and allocate storage space.