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Knowledge Base TreeSize

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I've noticed that the "Last Access" date is not updated, it is much older than the "Last change" date. What is the reason for this?

The last access date of a file is maintained by Windows. Since Windows Vista/Server 2008, Microsoft disabled the automatic update for the "Last access" date by default to improve system performance on NTFS formatteddrives. Because of this, the date won't be updated anymore if a file content is changed for example. That is also the reason why the last access date isn't a good indicator anymore for recent usage of a file.

For more information on this topic, please refer to the following MSDN article:
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-2000-server/cc959914(v=technet.10)

Why is the allocated space that Windows shows in the properties dialog of the drive different to the allocated space reported by TreeSize?

The Windows Explorer and the TreeSize drive list do show the space that is physically allocated on the drive while TreeSize shows the space that is occupied by all files under a certain path. Please make sure that you have the view option "Allocated Space" activated when you are interested in the physically allocated space.

Another possibility is that not all parts of the drive could be scanned due to access restrictions. Therefore it is highly recommended to run TreeSize as administrator. If you want to get notified if a folder cannot be scanned, please open the options dialog (File > Options) and enable "Show error messages during scan" under the option page "Scan > General". Turning on the Option "Track NTFS specific features" in the Options dialog may result in more accurate results, because it racks e.g. hardlinks, but slows down scans. If a drive letter points to a sub-folder of a network drive, the allocated space (correctly) reported by TreeSize may also be much smaller than the physically allocated space on this drive reported by the Windows Explorer because possibly the whole drive is not accessible through the network.

Beyond the space that is needed for storing the files itself, additional space is used for storing management data like the File Allocation Table of the file system or the boot sector. It is not possible to free this space with TreeSize or any other tool. This is usually 0.5 - 2% of the occupied space.

Another possibility is that you are using a Software RAID - like Windows offers it - which spreads the data with redundancy over several disks. These disks will appear as one logical volume and the failure of a single disk will not cause any data loss. But for storing the redundant information additional space is needed, which cannot be used for user data.

A special characteristics of Offline Files can lead to wrong values for the allocated space of stub files. To avoid this, either ensure that the user which runs the scans has full read access to the scanned file system.

Is there a limit on the size of disk being searched?

Since TreeSize holds file information of scanned directory structures in your system RAM, the theoretically maxiumum disk size that can be scanned or searched by TreeSize is only imitated by your systems memory. 

The 32 bit edition of TreeSize can use a maximum of 2 GB RAM (default for Windows applications). This is sufficient for most Home or Small Business environments.

For larger file system structures with several million of files, we recommend the native TreeSize 64 bit edition which is available in TreeSize Professional.

Is there a way to export a full detail report down to the item level with using TreeSize Professional?

Yes. To get a full report in Excel  in TreeSize Professional, you need to check-mark the option "Tools > Options > Export > Excel > Export the full directory branch" and "Include single files in export". Then choose "File > Export > Excel File".

Is TreeSize also available as portable version which can be installed and run from an USB stick?

The full version of TreeSize Professional can be installed on an USB stick and can be run from there. To install TreeSize Professional as "portable edition", install it normally on a PC, run TreeSize and click "Tools > Create portable edition".

Why do the exported XML files do not contain any files?

If we would include also the metadata of files, the XML files would grow by factor 10-20 and reach a size that cannot be handled reasoably.

If you need history datas and growth report on file level, we would likew to recommend our product SpaceObServer. It regularly collects the file system information using a background agent and stores it in a SQL database, including size development and (optionally) all permissions. The reporting is faster and more flexible compared to TreeSize, because it is built on a database and collects data on file level. SpaceObServer offers advanced scripting capabilities through OLE Automation.

Is TreeSize able to show file permissions, and not just ownership?

Yes. This web page provides an overview on the permissions reporting capabilities of TreeSize.

Right clicking on the header of the Details list will show a popup menu that allows to choose additional columns showing the permissions.
 
If you export a scan to Excel, these columns will be included as well. (To get a full report in Excel, you need to check-mark the option "Tools > Options > Export > Excel > Export the full directory branch" and optionally "Include single files in export"). Excel Auto-Filter is a good tool to filter the exported lists for specific users or groups. Our product SpaceObServer has better reporting capabilities since V6, for details please see here.

I was doing a custom file search on my server. when I export the results it takes very long to create the file. Is there any way to speed this up?

Do you have activated the "Owner" or the "Permissions" column? In Active Directory environments Windows can take a long time to query these values. To speed this up, the only option is to turn off these columns using the"View" menu if not needed.

Is there a way to get alerted by TreeSize once the free disk space drops below a certain level?

TreeSize is a stand-alone EXE and not able to do this out of the box. But our product ServerSentinel is specialized in observing servers for states like low disk space and send a notification by email or text message (SMS). Please find additional information at: ServerSentinel - diskspace sensor

Can I create a report that shows the difference between two folders?

You can compare a scan to another folder using "Scan > Compare with path". This will show the size and file count differences on folder level between the path that was scanned, and the one that was selected for comparison.

Does the TreeSize scan and/or search affect the archival bit of the scanned files?

No. TreeSize does not actively change the archive bit, and the system only changes the archive bit if a file is written. TreeSize works strictly read-only when scanning and searching and also does not modify the last access date if possible,

After running a deduplication, when I start the same duplicates search again, the same duplicate files appear and nothing appears to have happened, although the logs show they were deduplicated.

In most cases, the reason for this is that Windows is not reporting the amount of hardlinks correctly.

In order to filter out files that were already deduplicated, TreeSize will ignore files that have more than one hard link. For files that are accessed via a network drive, however, there are cases where the amount of hard links is not returned correctly by the operating system, as stated in this article: https://knowledgebase.jam-software.com/7092