Partition Magic - Partition Manager Software

Extend partition with one step
Resize/Move partition without data loss.
Create, delete and format partion with simple steps.
Copy partition and disk to transfer data with ease. Support disk and partition size larger than 2 TB. Keep your data safe even in case of power outages or hardware failure.
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About Resize Clusters

  • Use Resize Clusters to change the cluster size on FAT, FAT32, and NTFS partitions. Reducing cluster size may help you reclaim wasted space on your hard disk.
    All files on FAT and FAT32 partitions are stored in allocation units called clusters. Each file is allocated at least one cluster, resulting in wasted space in clusters containing small files. The size of a partition determines cluster size. Larger partitions have larger clusters, and, therefore, more wasted space. For more information about managing your hard disk space, click See Also on the Help toolbar.
    It is not recommended that you use the smallest cluster size on partitions containing a single, large file, such as a database or swap file.
    Default Cluster Sizes A partition's cluster size is set by the DOS FORMAT operation, based on the size of the partition, as shown in the following tables.

    DOS and Windows default FAT cluster sizes

    Partition Size (MB) FAT Type Sectors Per Cluster Cluster Size



    8 512 bytes
    16-127 16-bit 4 2 K
    128-255 16-bit 8 4 K
    256-511 16-bit 16 8 K
    512-1,023 16-bit 32 16 K
    1,024-2,047 16-bit 64 32 K
    2,048-4,096 16-bit 128 64 K*

    *Only available with Windows NT and Windows 2000/XP. Windows FAT32 cluster sizes

    Partition Size (GB) Sectors Per Cluster Cluster Size


    8 4 K
    8.02-16.02 16 8 K
    16.03-32.04 32 16 K
    > 32.04 64 32 K

    Resize Clusters Information
    The Resize Clusters dialog box displays the possible cluster sizes from 512 bytes to 64 KB. For each cluster size, PartitionMagic displays the following:

    ?A bar graph and percentages represent how much space would be used and how much space would be wasted if you chose that cluster size for the currently selected partition
    ?Wasted space (in megabytes)
    ?The range of allowable partition sizes (in megabytes) or other information
    ?If a cluster size requires a partition that is too small for the data and files on the partition, "Not Allowed" appears in the Notes column. "Not Enabled" appears in the Notes column for the 64 KB cluster size because it is only used for Windows NT. You can enable the 64 KB cluster size, but it is not recommended.
    The lower area of the Resize Clusters dialog box displays information about the current and new cluster size, as well as the current and new partition size (based on the new cluster size). You can click the New cluster size drop-down list to change the cluster size.
    PartitionMagic adheres to the established limits for partition and cluster sizes. You cannot select a cluster size that is invalid for the selected partition. Choosing a smaller cluster size may resize the partition smaller, creating free space next to the partition. You can use this free space to create a new partition.

    To resize clusters

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