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Two synchronised Hard Drives have differing free spaces

This is a discussion on Two synchronised Hard Drives have differing free spaces within the Windows 10 Support forums, part of the Tech Support Forum category. I have two 8Tb Hard Drives (synchronised for security) yet they have differing free spaces. As you can see -


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Old 05-31-2020, 11:15 PM   #1
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I have two 8Tb Hard Drives (synchronised for security) yet they have differing free spaces. As you can see - there are really minor differences in two system image folders .1Gb up and down and vice versa so they cancel each other out, yet there is a 46Gb difference in "free space". I have run "File Checks" from the Properties drop down on both but I can't get them to agree. Two questions-
1) What is causing this and
2) How can I bring them back into agreement with each other?
I COULD copy them both to other 8Tb HDDs but that seems a rather BIG task as they are both over 7Tb used....
Windows 10 Pro 64bit fully up to date....
Thanks in Anticipation

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Old 06-01-2020, 02:30 AM   #2
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Use Spacesniffer to see what areas are different. Make sure Hidden files are viewed
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Old 06-01-2020, 06:06 AM   #3
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Just a question: What is "Synchronized for Security"? How did you do that?
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Old 06-01-2020, 06:10 AM   #4
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Quote:
Originally Posted by bassfisher6522 View Post
Just a question: What is "Synchronized for Security"? How did you do that?
Probably means mirrored for data security (redundancy), using a file sync utility.
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Old 06-01-2020, 07:03 AM   #5
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Quote:
Originally Posted by bassfisher6522 View Post
Just a question: What is "Synchronized for Security"? How did you do that?
I DO have RAID mirrors but not for these two drives. I transfer my downloads to nominated folders on drive G: and, every now and then, I use a utility called "Total Commander" to synchronise the drives, G: and F:. I do the same with drives R: and S: but, luckily THEY has stayed in sync
Some time over the last year or so the drives got out of sync but only with the "free space". Also every week or 10 days I do a "System Image" to G: and then to F: Next time to F: then G: hence they sometimes differ by a tiny detail like .1Gb....
Will Spacesniffer tell me where my "free space" has gone or will it just tell me what "Total Commander" already has like in my attachment, the size of each folder?
I suspect in my "addition" and "deletion" of data from F: some "space" has got "LOST"? Is there any utility that will find this "LOST" space and link it back to the "free chain"?
TIA
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Old 06-01-2020, 07:21 AM   #6
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Space Sniffer will show you what's occupying space on the drives so that you can see what's different between the two drives. 1GB difference is too small to matter or even hint at a filesystem inconsistency, I wouldn't worry about it especially since there are tasks that you're doing to each drive separately and at different times.
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Old 06-01-2020, 09:03 AM   #7
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Quote:
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Space Sniffer will show you what's occupying space on the drives so that you can see what's different between the two drives. 1GB difference is too small to matter or even hint at a filesystem inconsistency, I wouldn't worry about it especially since there are tasks that you're doing to each drive separately and at different times.

It's 46Gb....
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Old 06-01-2020, 10:40 AM   #8
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Quote:
Originally Posted by louwin View Post
It's 46Gb....
Then run Space Sniffer. It should be pretty simple and straightforward.
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Old 06-01-2020, 11:57 PM   #9
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Quote:
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Then run Space Sniffer. It should be pretty simple and straightforward.
Thanks for your response....
I've run Space Sniffer, it shows where every folder and files is(?), and it has confirmed the free space calculation by Total Commander and the "Properties" drop down but it still hasn't told me where my 46Gb are....
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Old 06-02-2020, 03:14 AM   #10
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The partition sizes may be different. Try Minitool Partition Manager
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Old 06-02-2020, 09:37 AM   #11
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Quote:
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The partition sizes may be different. Try Minitool Partition Manager
No, I created them within minutes of each other and their details are identical.
Besides they both have EXACTLY the same used space. Except for 2 System Image folders which each vary by .1Gb up and down, their other identical folders match sizes to the megabyte. The ONLY difference is the free space and that is by 44Gb.... Using Sniffer "free space" on F: is 695Gb and G: is 651Gb.
When I thought the difference was 46Gb it was actually 46Gib????
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Old 06-03-2020, 11:50 PM   #12
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Use https://www.jam-software.com/treesize_free and run it as administrator via right-click. Analyse one drive. Run a second instance of the same utility and analyse the other drive. Stack the two instances side by side for comparison. There are two folders in particular whose contents we do not know are in sync; system volume information and the recycle bin system folder. On a second look, I see the recycle bin folders are in sync, but the system volume information folders are not, looking at the dates (modified).
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Old 06-14-2020, 06:43 AM   #13
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Sorry for not replying but I got locked out of my account for not remembering the password. The password reset routine is VERY involved and kept me amused for many days..... I tried to use the system generated password and got stuck in a loop.
I kept plugging at my sync problem and I eventually brought them into sync again, well within a couple of megabytes :)
I cleared system restore points and everything else I had done many times before but all is good now....
THANKS
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Old 06-14-2020, 06:52 AM   #14
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Use CCleaner to wipe the free space on both, then sync.
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Old 06-19-2020, 12:55 AM   #15
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Does this forum support the concept of "Solved"? How do I flag my post as "Solved"?

Thanks :)
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Old 06-19-2020, 02:00 AM   #16
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Quote:
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Does this forum support the concept of "Solved"? How do I flag my post as "Solved"?

Thanks :)
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