Allocation unit size for exfat 16gb 32gb 64gb 128gb sd card or 500gb may vary according to different capacities.
Our advice: We strongly recommend you leave the allocation unit size to default value when formatting for exfat sd/usb/hdd/ssd.
If you want to change the cluster size value, you may read the following contents.
The default value of allocation unit size for exfat drive:
256MB - 32GB: 32KB
32GB - 256TB: 128KB
> 256TB: not supported
External resource: the default value of ntfs fat and exfat by Microsoft
If it's your sd card, micro sd card, cf card or other types memory card that needs a allocation unit size parameter when formatting, you may use the following for consideration.
Allocation unit size for exfat 128gb usb flash drive? You may take a look at the following parameters
#1 - You may format the usb/sd/hdd to exfat and reset the allocation unit size during formatting by disk management.
#2 - cmd to format exfat
Command Prompt, also known as CMD, is a command line interpreter available in the Windows operating system. It can help you perform many operations to solve various Windows problems and manage disks and partitions.
If you are familiar with the Windows 10 Command Prompt, you can also use it to format partitions and use commands to change the size of their allocation units. Please follow the steps below.
Notes: If you do not often use the Command Prompt to perform tasks, it is a good idea to make backups of important files on your discs, as sometimes incorrect actions may lead to unexpected data loss.
Step 1 : Type Command In the Windows 10 Cortana search box, right-click the most matching Command Prompt to select Run as administrator .
Step 2 : In the Command Prompt window, type 'diskpart' and hit Enter.
Step 3 : Then type the following commands in order and hit Enter After each time.
Select a disk* (* indicates the number of the target disk or partition)
Select partition *
Format as fs = exFAT unit = 32k (you can change 32k to another allocation unit size as desired.)
Question: Should I set the allocation unit size for exfat SSD/external hard drive the bigger better?
Answer: If there are only large files, such as a few GB in size (game files or movies), the larger allocation unit size may get a little better(Feedback from users on the syber world: it didn't speed much after converting the cluster size to bigger one).
Truth: It is not the larger the better, although the large block size may get a little fast, however it is easy to bring fragmentation, waste of hard disk space. For example, if you set the disk to 4096kb, a single file 5000kb would take two block size, one 4096kb, then the remaining 4kb still have to occupy another 4096kb unit, which causes a waste of space.