HDD free space error?

  1. Posts : 258
    Windows 10 (Home Ed.)

    HDD free space error?

    Hi. I have a 1TB external drive (USB) which Windows reports to have 145 GBs of available free space. Yet when I copy folders which amount to 80GBs to the drive, I get a report before completion that the drive is full and not all the folders making up the 80GBs will copy across.

    The actual usable space on the 1TB is drive is shown in Windows (and Disk Management) as 931GBs: the folders already present on the drive total 827GBs. Well that doesn't make 145 GBs free, but nevertheless still leaves enough space in theory for me to copy my 80GBs there...

    The Recycle Bin and System Volume Information folders on the drive show as empty, and System Restore is not set to touch the drive at all. 'CheckDisk' (or, 'Error Checking' in Properties/Tools) found no problems.

    Can anyone help me resolve this please? It just doesn't 'add up'!


    EDIT: Just realised that the disc is set as compressed. I guess that is probably the cause - though I still can't quite make sense of the numbers?

    ​Windows 10 '20H2' (Build 19042.928)
    Last edited by martinlest; 27 Apr 2021 at 21:24.
      My Computers

  2. Posts : 18,045
    Win 10 Pro 64-bit v1909 - Build 18363 Custom ISO Install

    Hello @martinlest,

    Just a thought, have you got ANY other Partitions or Hidden Partitions?

    You could use this for just for the Disk / Drive you are referring to . . .

     Partitions Screenshots

    Please post [ upload ] a screenshot of your partitions.


    • By default, some columns are compressed. FULLY widen ALL the columns, making sure that the contents within them are FULLY visible.

    > How to Post a Screenshot of Disk Management at Ten Forums

    About Mini Tool Partition Wizard:

    Mini Tool provides users with portable partition software to better configure disk and partitions, bringing brand new user experience and overcoming the many shortcomings in Windows Disk Management.

    Both 32-bit & 64-bit downloads available.

    > Mini Tool Partition Wizard FREE
    > Mini Tool Partition Wizard [ Portable ] - FREE


    > How to Upload and Post Screenshots and Files at Ten Forums

    I hope this helps!
      My Computer

  3. Posts : 4,687
    Windows 11 Pro 64 Bit 22H2

    I just realised that the disc is set as compressed. I guess that is probably the cause
    You just answered your own question.
    Also, if the drive is formatted FAT32 You cannot copy files that are larger then 4GB. You can only copy files larger then 4GB if the drive is formatted NTFS.
      My Computer

  4. Posts : 7,607
    Windows 10 Home 20H2

    Another related tool:

    Free Download Partition Expert Free Edition

    The free portable version works fine on my Windows PE.
      My Computer

  5. Posts : 258
    Windows 10 (Home Ed.)
    Thread Starter

    Thank you for the posts - I had forgotten the disc was compressed, but then most of my external HDD drives are set to compress all data copied to them. I don't usually see this - if Windows tells me there is 200GBs free and I copy a set of folders of, say, 175GBs, there is no problem.

    What makes me think that there is a problem somewhere is that another compressed disc also unexpectedly reported 'full' yesterday as well - really irritating it happened twice with two drives: however later in the day (actually in the early hours of this morning, still trying to compete a task before finally going to bed!) I tried copying the same files again (from a different source, but otherwise exactly the same), and it all copied across with no error this time.

    The drives are unpartitioned NTFS by the way (and the folders copied are 99% .dds graphic files, all 10MBs each).

    Thanks again.
      My Computers

  6. Posts : 4,687
    Windows 11 Pro 64 Bit 22H2

    The drives are unpartitioned NTFS by the way
    Each drive needs at least One Partition to Format it NTFS. Maybe you meant there is only 1 Partition and no extra partitions?
    Why are you compressing your drives? Compression was used in the old days, because of the size limitations of HDD's and the cost of larger drives. Today, Drives keep increasing in size and coming down in price, there is no reason to compress a HDD these days. Just get a bigger drive if you run out of space.
      My Computer

  7. Posts : 258
    Windows 10 (Home Ed.)
    Thread Starter

    Maybe you meant there is only 1 Partition and no extra partitions?

    Yes, that is what I meant.

    I can save a lot of space (depending of course on what is being backed up) by having compressed drives. I have spent more than enough on external storage space already over the past two or three years (12 drives now I think - the data is doubly backed up - a total of at least 30TBs): I can see no reason not to maximise it rather than spend yet more.
      My Computers


  Related Discussions
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 04:40.
Find Us

Windows 10 Forums