It is recommended not to exceed 32K for many small files, and 64K for large files is enough. Therefore, appropriate selection is necessary. The USB flash disk of 2.0 can be increased by up to 8m-12m/s, but the relative occupied space will be wasted. The larger the distribution unit, the faster the speed. The improvement of 64K and 128K is not very obvious. The following free tool is able to help format usb allocation cluster size to be 64k.ĤK VS 64K VS 128K Difference for USB Cluster SizeĪccording to the test, 4K is very different from 64K. If it's extremly large such as 512GB, you may use 64k in the allocation unit size. How to set allocation unit size for flash drive over 32GBįlash drive over 32GB may adapt allocation unit size 16k to 64k upon your own use. When the USB flash disk with a capacity of more than 64GB is formatted as exFAT, the system sets the allocation unit size 8096 (128G), 16K (256g), 32K (512g) by default. usb over 512GB allocation unit size - 64k or above is good.usb 128gb allocation unit size - 8096(8kb).usb 64GB - exfat file system with default, 4K - 8k is good.USB less than 32GB - fat32 file system with 4k allocation unit size woud be enough.
What is allocate unit size for usb drives? USB Storage Size and It's Allocation Unit SizeĪllocating unit size varies according to different capacities of flash drives from two categories less than 32gb with fat32 or over 32gb with exfat file system. Flash drive becomes slow after mass production fix.Allocation unit size for exfat usb flash drives over 32gb.
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