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TOPIC: Tech Tool Protection showing incorrect disk usage?

Tech Tool Protection showing incorrect disk usage? 04 May 2018 01:30 #9623

Running TechTool 9.2.6 on OSX 10.13.4
TechTool Protection panel says I have 150.26GB free space whereas Apple says I have 406.87GB free space?

I tried to upload screenshots but the forum didn't recognise them

Any ideas?
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Tech Tool Protection showing incorrect disk usage? 04 May 2018 10:14 #9624

The Finder does not take into account the space occupied by various files in invisible folders. The usage shown by the TechTool Protection system preferences pane agrees with the usage shown in the Storage tab of About This Mac, available under the Apple menu.

The Finder is not taking into account two types of data:

1. Backups that were stored locally because the intended destination volume was not available when the backup was created. Time Machine stores these backups, called Local Snapshots, in the invisible folder named /Volumes, in an invisible folder named .MobileBackups. Please see Time Machine MobileBackups: Apple Support Communities.

2. The data used to keep track of versions of files (the feature introduced in Lion), which is stored in an invisible folder named .DocumentRevisions-V100 at the root (top) level of the volume.


In Apple System Information (About This Mac-->More Information), there is a Storage tab at the top of the window. The Storage tab shows disk space allocated to backups
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MicroMat Inc
Makers of TechTool
Last Edit: 04 May 2018 10:18 by micromattech3.
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Tech Tool Protection showing incorrect disk usage? 04 May 2018 21:33 #9625

micromattech3 wrote:
The usage shown by the TechTool Protection system preferences pane agrees with the usage shown in the Storage tab of About This Mac, available under the Apple menu.

Unfortunately no it doesn't... I did check that before questioning it.. I've attempted to add a screen shot so hopefully it comes through.
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Tech Tool Protection showing incorrect disk usage? 04 May 2018 22:07 #9626

Thanks for the additional screen capture.

Please send a message to This email address is being protected from spambots. You need JavaScript enabled to view it. , including a link to this thread and the screen captures that show the difference in the amount of free space. You will receive a reply by email.

I assume that your internal volume Macintosh HD is the only volume on its drive. You should know that Apple has decided that with APFS, the free space shown for each of the APFS volumes in a given APFS "container" will be the sum of the free space available on all of the volumes in the container, counter-intuitive as that may sound. The reason is that if you start to save a file on one volume in a given APFS container, and you run out of room, the remainder of the file will be stored on another volume in the same APFS container.
MicroMat Inc
Makers of TechTool
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Tech Tool Protection showing incorrect disk usage? 04 May 2018 23:33 #9627

The TechTool Protection system preferences pane is reading the free space reported by an operating system tool called diskutil. Since you posted your results, we have looked at several cases in which diskutil does not agree with the Storage pane of About This Mac.

Please send to This email address is being protected from spambots. You need JavaScript enabled to view it. the results of the following exploration. Open Terminal, located in /Applications/Utilities. At the prompt, type:

diskutil list

Press the Return key.

You see output similar to this, but of course pertaining to your laptop:

Macintosh:/ MMT3$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_HFS Macintosh HD 4.0 TB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3

/dev/disk1 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk1
1: EFI EFI 209.7 MB disk1s1
2: Apple_HFS G-Drive_Q_232 249.2 GB disk1s2
3: Apple_Boot Recovery HD 650.0 MB disk1s3

/dev/disk2 (external, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *4.0 TB disk2
1: EFI EFI 209.7 MB disk2s1
2: Apple_HFS H_G_Wells 4.0 TB disk2s2

/dev/disk3 (disk image):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme +31.5 MB disk3
1: Apple_HFS VueScan 31.4 MB disk3s1


Disk 0 is my internal drive. On it is the volume called disk0s2 (disk0, slice or partition 2). It has this description:

Apple_HFS Macintosh HD 4.0 TB disk0s2

So, the volume named Macintosh HD is referred to by the operating system by its BSD (Berkeley System Distribution) identifier, disk0s2.

To see a description of disk0s2, type at the prompt:

diskutil info disk0s2

Press the Return key.

The result on my iMac:

Macintosh:/ MMT3$ diskutil info disk0s2
Device Identifier: disk0s2
Device Node: /dev/disk0s2
Whole: No
Part of Whole: disk0

Volume Name: Macintosh HD
Mounted: Yes
Mount Point: /

Partition Type: Apple_HFS
File System Personality: Journaled HFS+
Type (Bundle): hfs
Name (User Visible): Mac OS Extended (Journaled)
Journal: Journal size 311296 KB at offset 0x3a3c000
Owners: Enabled

OS Can Be Installed: Yes
Recovery Disk: disk0s3
Media Type: Generic
Protocol: SATA
SMART Status: Verified
Volume UUID: 619D872C-178E-3020-9E38-3B2B0A46A703
Disk / Partition UUID: D15B4D48-E44E-4920-9C06-447125276C6C

Disk Size: 4.0 TB (3999927271424 Bytes) (exactly 7812357952 512-Byte-Units)
Device Block Size: 512 Bytes

Volume Total Space: 4.0 TB (3999927271424 Bytes) (exactly 7812357952 512-Byte-Units)
Volume Used Space: 213.2 GB (213205983232 Bytes) (exactly 416417936 512-Byte-Units) (5.3%)
Volume Available Space: 3.8 TB (3786721288192 Bytes) (exactly 7395940016 512-Byte-Units) (94.7%)
Allocation Block Size: 8192 Bytes

Read-Only Media: No
Read-Only Volume: No

Device Location: Internal
Removable Media: Fixed

Solid State: No


Note that near the end of the output, there is a very precise description of the free space:

Volume Available Space: 3.8 TB (3786721288192 Bytes) (exactly 7395940016 512-Byte-Units) (94.7%)
MicroMat Inc
Makers of TechTool
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Tech Tool Protection showing incorrect disk usage? 09 May 2019 18:14 #11059

The discrepancy in the amount of free space shown by the Storage pane of About This Mac and the TechTool Protection system preferences pane is caused by a recent change Apple made in Mojave. The Storage pane is treating space occupied by purgeable files as free space, because it is potentially free space, because the files could be purged.
MicroMat Inc
Makers of TechTool
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