Ntfs allocation unit size windows#
To format the SSD for the best allocation unit size, you can make use of Windows Disk Management. If your SSD has been formatted to NTFS or FAT32 with other allocation unit size, but now you want to change the cluster size, you need to reformat it, which will delete everything on the drive. How to change SSD allocation unit size in Windows 11, 10, 8, 7? To get default allocation unit size for SSD with NTFS, FAT32 and exFAT, you can go through this link. So, the recommended allocation unit size for SSD should be the defaults: 4KB, which are set to reduce the space that is lost. Besides, larger unit sizes can lead to more writes over time and then cause more wear and tear on your SSD. When a large file is divided into several chunks based on the given allocation unit size, it will cost more time when reading the data. It seems that the smaller the SSD cluster size is, the more drive space you can save. Although the larger allocation unit size can help save much time in reading data, it will waste some space. Generally speaking, the smaller allocation unit size on the hard drive can help save storage space better. So, you might wonder what’s the best SSD allocation unit size. When you are formatting an SSD drive, the allocation unit size is set by default based on the partition size. What allocation unit size should you use for SSD? However, if you save a 513-byte file on the partition of 512 byte allocation unit size, it will occupy 1024 (512*2) bytes storage space, which will waste some space (you can do a rough match with the equation: (cluster size)/2 * number of files. If the file sizes do not come out to an even multiple of the cluster size, additional space will be used to hold the file up to the next multiple of the cluster size.įor example, when you store a 512-byte file into a partition with 512-byte allocation unit size, this file will take up 512 byte storage space. This file will be divided into several parts by the allocation unit size and stored on the hard disk. It represents the smallest amount of disk space that can be used to save a file.Įach allocation unit size can only hold one file. All the file systems organize your hard disk based on the allocation unit size/cluster size. So, what is the allocation unit size? The allocation unit size is also called as cluster size. If you have ever formatted an SSD, HDD, USB thumb drive, SD card or other hard drives, you might have seen the “Allocation Unit Size” setting.
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