Large allocation unit size can lead to more disk space waste and more wear & tear while small allocation unit size can make you spend more time accessing data. Of course, it’s not the same to use different allocation unit size. In many cases, you can just choose the default allocation unit size while formatting. Then, which is the best one for your SD card? Actually, the allocation unit size doesn’t impact SD card’s performance significantly. When you format SD card, USB flash drive, or external hard drive partition in Windows 11, 10, 8, 7, you can see that there are different options from 4K to 64 KB for allocation unit size. What’s the best allocation unit size for your SD card? The file will be saved on different clusters. If a cluster isn’t big enough to hold a file. If the size of the file is too small, the left space on the cluster can’t be used to contain other files. What is allocation unit size? And Which one should I choose for my SD card to make it in peak performance or should I just leave it as “Default”? Thanks." About allocation unit sizeĪllocation unit size, also called as cluster size or block size, describes size of a single cluster, which is the smallest unit to save data. "Intend to format my SD card to FAT32 and I see allocation unit size. How to choose allocation unit size for my SD card?
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