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 your photos, music and videos are stored (files typically 1MB+) I use the biggest AUS.
#Mac hard drive space allocation mac os x
With a 64K AUS there are a lot fewer blocks to keep track of and less fragmentation. If you prefer treemaps and want to check hard disk usage on your Mac, Disk Inventory X is your software The disk usage utility works on Mac OS X 10.3 (and. With a 4K AUS the data needs to be split over two blocks - and they may not be together so you get fragmentation. Similarly, partitioning allows you to allocate one portion of your drive to. Click Erase, then Erase again to confirm. If you arent using all the space on your C: drive, you can divide it into.
Choose the volume you created when you originally partitioned your drive. Go to Applications > Utilities and launch Disk Utility. Let's say you have a 3K file which needs to grow 2K. Now, back up your Mac and you’ll be ready to wipe and remove the partition. At first the storage bar estimates the amount of used and available storage space. Instead think about how the OS uses space. From the Apple menu in the corner of your screen, choose About This Mac. 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. So 4K wastes 2K per file and 64K wastes 32K. The average space wasted per file will be half the chosen AUS. In terms of space efficiency, smaller allocation unit sizes perform better.
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