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# Windows 7: Undo NTFS compression

 21 Nov 2015 #11 torchwood W7 home premium 32bit/W7HP 64bit/w10 tp insider ring 4,872 posts properties Have you changed the default option here, according to your screenshot drive should be H. Roy Attached Thumbnails My System Specs
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 22 Nov 2015 #12 mp5 Windows 7 Home Premium 64bit 12 posts Oslo, Norway Thank you Roy, for taking time helping out with my problem! Yes, I have tried changing attributes for drive H, in addition to the single file on the drive. Compression for H can be set ON/OFF without getting Windows error message. (Tried both options: Only H, and H incl. folders/ files) However, the box is always unchecked when I go back to see properties status. Properties for the .flkb file on drive H remains stuck with a checked box, I get a Windows error message when trying to disable. The paradox is that Windows never started the compression process in the first place, it only marked the file as if! Attached Thumbnails My System Specs
 22 Nov 2015 #13 torchwood W7 home premium 32bit/W7HP 64bit/w10 tp insider ring 4,872 posts whats here What settings here, Roy Attached Thumbnails My System Specs
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 22 Nov 2015 #14 Ztruker Windows 10 Pro X64 6,291 posts Space Coast of Florida I have this squirrelled away, maybe it will help: Compression is sometimes turned on by disk cleanup, to prevent this from happening again delete this registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\Explorer\VolumeCaches\Compress old files You can export the key before deleting it, just in case you want it back. Disable compression from disk properties or use the following command: compact /u /a /f /i /s:c:\ Change c:\ to the letter assigned to the drive you are working with. My System Specs
 24 Nov 2015 #15 mp5 Windows 7 Home Premium 64bit 12 posts Oslo, Norway Quote: Originally Posted by torchwood What settings here, Roy I have the very same settings! Attached Images My System Specs
 24 Nov 2015 #16 Layback Bear Windows 10 Pro. 64/ version 1709 26,197 posts Northern Ohio I'm surly no expert but is it possible that their isn't enough room on the drive to decompress it? The picture only shows 2.1MB free space. My System Specs
 24 Nov 2015 #17 mp5 Windows 7 Home Premium 64bit 12 posts Oslo, Norway Quote: Originally Posted by Ztruker I have this squirrelled away, maybe it will help: Compression is sometimes turned on by disk cleanup, to prevent this from happening again delete this registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\ CurrentVersion\Explorer\VolumeCaches\Compress old files You can export the key before deleting it, just in case you want it back. Disable compression from disk properties or use the following command: compact /u /a /f /i /s:c:\ Change c:\ to the letter assigned to the drive you are working with. I was me that unfortunately tried to turn on compression! This is explained in my first post! But Windows aborted immediately with an error message; Not enough space! So main issue is Windows marked the file's properties with "compression ON" and now refuses to turn it off for the same reason; Not enough space! I don't have that registry key! Don't know how or why it disappeared.. I ran your suggested command. It does not say OK for the Locker -file yet, but I guess the blinking cursor means it's working on it? It's been running for a two hours now.. Since the Locker -file is not really compressed physically, I would've thought it go rather quick!? Attached Images My System Specs
 24 Nov 2015 #18 mp5 Windows 7 Home Premium 64bit 12 posts Oslo, Norway Quote: Originally Posted by Layback Bear I'm surly no expert but is it possible that their isn't enough room on the drive to decompress it? The picture only shows 2.1MB free space. It is NOT enough space for decompression, but thing is nothing has ever been compressed! Please read my first post! Thanks... My System Specs
 25 Nov 2015 #19 Pyprohly Windows 10, Windows 8.1 Pro, Windows 7 Professional, OS X El Capitan 722 posts In a house There is an 'Uncompress' method of the CIM_Directory WMI object. It's worth a shot... Enter these lines in a PowerShell shell. Code: $folder = (gwmi -q "SELECT * FROM CIM_Directory Where Name='C:\\folder\\to\\uncompress'")$folder.Uncompress() My System Specs