Is it possible to change a hard drive's file allocation unit size without formatting or at least not lose files?


There are third party partition managers that allow you to change the cluster size without reformatting. One example is the MiniTool Partition Wizard (all non-free versions):


Be aware that all changes to a partition might corrupt the data. Backing up the important files is always a good idea.

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    Acronis Disk Director only changes cluster size for the free space on the volume: kb.acronis.com/content/14636. – haimg Jun 5 '12 at 17:20
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    And MiniTool Partition Wizard can only change the cluster size without formatting of dynamic disks, not basic disks. – Synetech Jun 5 '12 at 17:45
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    I don't think GParted GUI can't do it either; I just booted into it and there is no option to select the allocation unit size (or cluster size) when changing the partition. I read elsewhere that it uses 4096. – David Murdoch Apr 7 '15 at 19:50
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    @DavidMurdoch: I based my answer on an eHow article, but GParted doesn't even let you choose the cluster size when creating a partition. – Dennis Apr 7 '15 at 22:06

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