![]() ![]() Therefore, allocation unit is the smallest logical data storage unit.Īs mentioned about, a cluster is composed of sectors. Hence, the operating system will combine adjacent sectors to form an allocation unit (also called cluster), and then manage data in the unit of cluster (in the level of OS) to efficiently utilize resource. However, there are so many sectors on the hard drive that the operating system cannot address all of them. When a file is stored into hard drive, it will be divided into blocks to be stored in sectors. In general, the sector size is fixed to 512 bytes or 4096 bytes (4 K). But, what’s the functionality of the allocation unit size option? To figure out this, please read the following contents.ĭo you know the structure of hard disk? If you know about hard disk, you may know that sector is the smallest data reading and writing unit in disk level. When you create/format a partition, you are offered a window, allowing you to choose a file system and an allocation unit size, just like the following picture: How to Change FAT32 Allocation Unit Size. ![]()
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