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

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up vote 4 down vote accepted

There are several third party partition managers that allow you to change the cluster size without reformatting.

Examples:

(source)

GParted is free software. You can download a LiveCD from here.

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
    
@haimg: Thanks for the heads up. –  Dennis Jun 5 '12 at 17:24
    
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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