I have a folder on a NTFS network drive. I had copied it over from my local NTFS drive. Its displayed size on the network drive is totally confusing to me:

Size:           1,34 GB
Size on Disk:   12,2 GB

How can there be a tenfold discrepancy between size and size on disk? And what is the true size now?

  • try defragmenting the drive and check size again...may be its the way in which a file is saved across different sectors of a HDD. You could also try deleting it and copying again
    – David Kent
    Mar 7 at 8:00
  • well its not my drive, guess I'll talk to the admin about it Mar 7 at 8:04
  • wait so u copied a file from your local drive to the network drive ?
    – David Kent
    Mar 7 at 8:07
  • a complete folder yes. Isn't that what I'm saying in my OP? Mar 7 at 8:07
  • 2
    here you go: superuser.com/questions/704218/…
    – David Kent
    Mar 7 at 8:11

It turns out the smb allocation roundup size was (and I guess by default is) set to 1048576 (i.e. 1MB), so even small files appear to have that size.

This was reported here as well. Lowering the value to 131072 as suggested there resolves the issue.

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