O&O Defrag 23 Product manual

O&O Defrag 23 
Why is the ClusterView different on HDDs and SSDs?

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The Cluster View displays a drive's allocation graphically.

To see this, select one or more drives from the drive list and click ClusterView below the status window. Please note that by selecting multiple drives, you can view them in a split cluster view.

The Clusterview should provide the most exact image of the hardware as possible. An HDD is divided into clusters that usually correspond to the size of the pages in Windows, these are more or less arranged as seen in the classic ClusterView.

For SSDs, however, this rudimentary view is too inaccurate. SSDs are also divided into clusters but they manage the clusters blockwise. This changes the type of occupancy and the consequences of fragmentation.

When fragmentation occurs in an HDD, it makes little impact on the speed and wear of the HDD if the fragments are combined or arranged consecutively. Small gaps do not pose a problem here although it is also true that data arranged consecutively be read more quickly because the movements of the read/write head are reduced.

There is a big difference with an SSD. Combining the fragments only may result in more blocks being occupied than necessary. That’s why it’s so important for the fragments to be combined and all data written consecutively, i.e. to avoid any gaps. This potentially reduces the number of occupied blocks and extends the lifetime and performance of the SSD significantly.

The new ClusterView now maps the blocks of an SSD and the clusters they contain. In extreme cases the reduction in the number of occupied blocks is clearly visible. It can also be read if there are any occupied blocks that are poorly constructed such as a block with two occupied clusters and one with three occupied clusters; these two blocks could be combined.

Description Explanation
Being processed O&O Defrag is working on clusters contained in this block.
Locked exclusively The block contains files that are exclusively locked by Windows or other applications (e.g. the registry).
Paging file The block contains parts of the paging file.
Fragmented The block contains parts of a fragmented file.
Folder The block contains parts of a non-fragmented directory.
Compressed At least one cluster is allocated by a non-fragmented compressed file (NTFS only).
Allocated At least one cluster is allocated by a non-fragmented file.
System At least one cluster is allocated, but could not be assigned to a file.
Reserved for MFT This area is reserved for the Master File Table (NTFS only).
Free All clusters are empty.

Fragment filter
The fragment filter only displays those areas in red (according to the settings), which contain files that have more than X fragments.

With a right click within the block view you reach the menu of the fragment filter.