I have check there is no compression check on ntfs settings but still also 1 TB file shows 60 GB on disk.
How is this possible ?

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2 Answers 2


You have a sparse file. Regions of it which are still empty (not yet written by the program) are not stored on disk at all – instead of pointing to some specific area on disk, they're marked as "unallocated" in NTFS and just automatically appear as 0x00-bytes when read.

  • i have also another issue in System volume information /Dedup/chunk this folder take much space of drive and keep going why Mar 29 at 10:58
  • how to off sparsing Mar 29 at 10:58
  • 1
    I don't think you can turn it off globally, but what's the point anyway? Usually people want files to occupy less space, not more? Mar 29 at 11:04
  • 1
    @Hammadleo91: Making this file non-sparse is possible, but will waste 29 GB of disk space. Why do that?
    – harrymc
    Mar 29 at 11:05
  • okay will not do that but what about dedup taking most space in chunk foolder Mar 29 at 11:22

If you wish to find which file or files in the folder are sparse:

If there is just one sparse file, it would be the only file whose size is around 29 GB, so very easy to locate.

If it's more than one file, you may locate the sparse files using this PowerShell command (once you're positioned to the folder):

Get-ChildItem -Attributes SparseFile

Reference : PowerShell Get-ChildItem.

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