Solved "Mystery Data" is taking up 18GB of space on my SSD

Jemjem787

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My Computer My Computer

At a glance

MS Windows 7 Home Premium 64-bit SP1Intel Core i7 3770K @ 3.50GHz8.00 GB Dual-Channel DDR3 @ 679MHzEVGA GeForce GTX 760 Graphic Card - 1085MHz C...
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
MS Windows 7 Home Premium 64-bit SP1
CPU
Intel Core i7 3770K @ 3.50GHz
Motherboard
ASUSTeK COMPUTER INC. P8Z77-V LX (LGA1155)
Memory
8.00 GB Dual-Channel DDR3 @ 679MHz
Graphics Card(s)
EVGA GeForce GTX 760 Graphic Card - 1085MHz Core - 4GB GDDR5
Sound Card
Realtek High Definition Audio
Monitor(s) Displays
2 Acer and 1 Asus
Screen Resolution
1920x1080 and 1280x1024 ans 1280x800
Hard Drives
120GB Kingston HyperX SSD
1.8TB Western Digital
932GB Western Digital
932GB Western Digital
932GB Western Digital
PSU
750W Coolermaster
Case
Coolermaster 912
Cooling
3 Fans, an Extreme CoolerMaster CPU Heatsink
Keyboard
G110 Logitect Black USB Backlighting Keyboard
Mouse
Synaptics PS/2 Port TouchPad
Internet Speed
60MB p/s
Antivirus
Microsoft Security Essentials
Browser
Chrome
Install TreeSize Free.
Open Control Panel, Folder Options.
Click on the View tab.
Select or unselect choices as necessary so it looks like this:
ShowAllFilesAndFolders.jpg
Click Apply then OK. Start TreeSize Free. Click on Scan and select the drive you want to look at.
TreeSizeFree.jpg
TreeSize Free will show you where all the space is being used.
TreeSizeFree1.jpg
 

My Computer My Computer

At a glance

Windows 10 Pro X64Intel Quad Core i7-4770 @ 3.4Ghz16.0GB PC3-12800 DDR3 SDRAM 1600 MHzIntel Integrated HD Graphics
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Lenovo IdeaCenter 450
OS
Windows 10 Pro X64
CPU
Intel Quad Core i7-4770 @ 3.4Ghz
Memory
16.0GB PC3-12800 DDR3 SDRAM 1600 MHz
Graphics Card(s)
Intel Integrated HD Graphics
Sound Card
Realtek HD Audio
Monitor(s) Displays
HP 22" LCD
Screen Resolution
1680 x 1050
Hard Drives
250GB Samsung EVO SATA-3 SSD
2TB Seagate ST2000DM001 SATA-2
1.5TB Seagate ST3150041AS SATA
Keyboard
Dell USB
Mouse
Lenovo USB
Internet Speed
Cable via Road Runner 3MB Upload, 30MB Download
Antivirus
Windows Defender, MBAM Pro, MBAE
Browser
Seamonkey
Other Info
UEFI/GPT
PLDS DVD-RW DH16AERSH
That space could be being used by:

  • pagefile.sys
  • hiberfil.sys
You normally can't see those files unless you do what Ztrucker suggests.
 

My Computer My Computer

At a glance

W7 Ultimate SP1, LM19.2 MATE, W10 Home 1703, ...AMD Phenom II x6 1100T, 3.3 GHz12GB DDR3 1333 G-Skill (4GB x 2), G-Skill (2G...NVIDIA GeForce GTX 660
Computer type
PC/Desktop
Computer Manufacturer/Model Number
n/a
OS
W7 Ultimate SP1, LM19.2 MATE, W10 Home 1703, W10 Pro 1703 VM, #All 64 bit
CPU
AMD Phenom II x6 1100T, 3.3 GHz
Motherboard
ASUS M4A88T-M/USB3 (AM3)
Memory
12GB DDR3 1333 G-Skill (4GB x 2), G-Skill (2GB x 2)
Graphics Card(s)
NVIDIA GeForce GTX 660
Sound Card
Realtek?
Monitor(s) Displays
Samsung S23B350
Screen Resolution
1920x1080
Hard Drives
WD Green 2TB (SATA), WD Green 3TB (SATA), WD Blue 4TB (SATA), WD Blue 6TB (SATA)
PSU
Cooler Master
Case
Antec GX300 Tower
Cooling
3x Antec TRICOOL 120mm Fans
Mouse
Wired Optical
Internet Speed
DSL
Antivirus
Avast
Browser
Pale Moon (64 bit)
Other Info
2018-12-27 Upgraded HDDs
2015-12-10 Upgraded case, graphics card, storage
2015-08-15 Upgraded motherboard & RAM
2015-07-15 Upgraded LM17.1 to LM17.2
It may also be the shadowstorage. Run this command:

vssadmin list shadowstorage

Have a look how much space is allocated on C:\
 

My Computer My Computer

At a glance

Vista, Windows7, Mint Mate, Zorin, Windows 8from 1.6GHz Duo to i7
Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
OS
Vista, Windows7, Mint Mate, Zorin, Windows 8
CPU
from 1.6GHz Duo to i7
Monitor(s) Displays
2x HP w2207
Hard Drives
5x HDD, 7x SSD, 12x Externals
Keyboard
with trackball - no mices
Mouse
Trackball mice
Internet Speed
DSL 6000
We fixed it, i missed the selections that ztruker did on his folder options.
ShowAllFilesAndFolders.jpg
 

My Computer My Computer

At a glance

MS Windows 7 Home Premium 64-bit SP1Intel Core i7 3770K @ 3.50GHz8.00 GB Dual-Channel DDR3 @ 679MHzEVGA GeForce GTX 760 Graphic Card - 1085MHz C...
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
MS Windows 7 Home Premium 64-bit SP1
CPU
Intel Core i7 3770K @ 3.50GHz
Motherboard
ASUSTeK COMPUTER INC. P8Z77-V LX (LGA1155)
Memory
8.00 GB Dual-Channel DDR3 @ 679MHz
Graphics Card(s)
EVGA GeForce GTX 760 Graphic Card - 1085MHz Core - 4GB GDDR5
Sound Card
Realtek High Definition Audio
Monitor(s) Displays
2 Acer and 1 Asus
Screen Resolution
1920x1080 and 1280x1024 ans 1280x800
Hard Drives
120GB Kingston HyperX SSD
1.8TB Western Digital
932GB Western Digital
932GB Western Digital
932GB Western Digital
PSU
750W Coolermaster
Case
Coolermaster 912
Cooling
3 Fans, an Extreme CoolerMaster CPU Heatsink
Keyboard
G110 Logitect Black USB Backlighting Keyboard
Mouse
Synaptics PS/2 Port TouchPad
Internet Speed
60MB p/s
Antivirus
Microsoft Security Essentials
Browser
Chrome
Next time you are in doubt, run WinDirStat. That tells you exactly what's on your disk - not the shadows though. For those you have to run the vssadmin command. https://windirstat.info/
 

My Computer My Computer

At a glance

Vista, Windows7, Mint Mate, Zorin, Windows 8from 1.6GHz Duo to i7
Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
OS
Vista, Windows7, Mint Mate, Zorin, Windows 8
CPU
from 1.6GHz Duo to i7
Monitor(s) Displays
2x HP w2207
Hard Drives
5x HDD, 7x SSD, 12x Externals
Keyboard
with trackball - no mices
Mouse
Trackball mice
Internet Speed
DSL 6000
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