FORMAT EXTERNAL HARD DRIVE WINDOWS 7 ALLOCATION UNIT SIZE KEYGEN
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With a 4K AUS the data needs to be split over two blocks – and they may not be together so you get fragmentation. Let’s say you have a 3K file that needs to grow 2K. Instead, think about how the OS uses space. To find out what the cluster size is on an existing disk:Ĭompare 4K vs 64K average case waste (32K-2K = 30K), for 10,000 files that only come out to 300,000KB or around 300MB. For a windows boot partition I use the Windows default (which is 4K for any NTFS drive smaller than 16TB). 16x the block size means 1/16th the number of blocks to keep track of.įor a media disk where you photos, music and videos are stored, every file is at least 1MB I use the biggest AUS. Let’s say you have a 3K file which needs to grow 2K. Instead think about how the OS uses space. However, as Jonathon points out, modern drives are massive and a little wasted space is not worth fussing over and this shouldn’t be a determining factor (unless you are on a small SSD).Ĭompare 4K vs 64K average case waste (32K-2K = 30K), for 10,000 files that only comes out to 300,000KB or around 300MB. 4K is best for fat32 usb/sd card less than 8GB or you may leave it default allocation unit size when formatting by Windows or. This above cmd is the terms to know the current allocation unit size of your local drive (external drives exempted). So 4K wastes 2K per file and 64K wastes 32K. Allocation unit size for fat32 64gb 128gb 1tb for hard drive usb flash drive or sd cf card etc. The average space wasted per file will be half the chosen AUS. In terms of space efficiency, smaller allocation unit sizes perform better.