Allocation Unit Size Usb. The problem was how to address many sectors on a drive. When I click the Restore device defaults button, the allocation unit size is changed to "Default allocation size" [(C) below].
Default cluster size for NTFS, FAT, and exFAT The optimal allocation unit size for your drive will often depend on which operating system you're using and how big the drive is. When I click the Restore device defaults button, the allocation unit size is changed to "Default allocation size" [(C) below]. It can also be called cluster size and it is the smallest possible.
From what I have searched, people say keep it default.
It depends on what you are using the drive for and what kind of files you are going to keep on it.
To reduce the overhead of managing on-disk data structures, the Refer to the below mentioned article and see if it provides information you are looking for. According to Microsoft, the allocation unit size "Specifies the cluster size for the file system" - so it is the value shown for "Bytes Per Cluster" as shown This works well and reminds you of the significance of allocation unit size. Should You Use Different Sizes for SSDs or Hard Drives?