Inaccurate Hard Drive Space Calculation

I recently purchased a 6TB Seagate Backup Plus Drive for my Windows 10 computer.   I copied all of the files from my 4TB Seagate Drive (which currently has about 3.5 TB used) to the new drive.  Now the new drive shows approximately 5.45 TB used.  I checked the "Properties" for each of the folders on the new drive, but the total space used is the same 3.5 TB on the smaller drive.  There is no indication as to where the extra 2TB of storage is being used.  Please advise.


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JohnBusiness Consultant (Owner)Commented:
Please look at the drive in Disk Management (Admin tools) and see how big the main partition is.

Perhaps the BIOS on your machine cannot see such a large drive.
crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
maybe the computer cannot address > 4 tb?
How much memory does it have?
What OS are you using? what bit-ness?
philsimmonsAuthor Commented:
Attached is the Screen Shot of what Disk Management shows.  It appears that everything's in order.

Seagate Drive Stats
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JohnBusiness Consultant (Owner)Commented:
Get a copy of Tree Size (trial version) or WinDirStat. Install and run and then post back what are the biggest folders.

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philsimmonsAuthor Commented:
I'm not sure exactly what Crystal's asking, but here are my computer's system stats:

T440s System Stats
crystal (strive4peace) - Microsoft MVP, AccessRemote Training and ProgrammingCommented:
perhaps partition the drive into 2 or more logical drives that are smaller? So maybe the address of a file would not be bigger than what the OS can address?

perhaps the unused space is in non-addressable areas ...
JohnBusiness Consultant (Owner)Commented:
Nothing wrong with the machine statistics. Try the drive space tools.
Lee W, MVPTechnology and Business Process AdvisorCommented:
Please see my article on using tools to find out what's using space:
Lee W, MVPTechnology and Business Process AdvisorCommented:
Also, check the allocation unit size.  If the old drive used 4K clusters and the new drive uses 64K clusters AND you have a LOT of small files, then you could literally be using 16x more space for the same amount of data.
philsimmonsAuthor Commented:
Well, that solved it.  There's a folder called "Seagate Dashboard" (which I just assumed had the usual operating files so I didn't check the folder size).  Turns out it has a duplicate of my other hard drive totaling 2.5TB.   If you know how to eliminate it - or if I can just delete it - please let me know.  If not, I'll try contacting Seagate.

Thanks, John
JohnBusiness Consultant (Owner)Commented:
Thanks for the update and I was pleased to help.
philsimmonsAuthor Commented:
Turns out the new hard drive had a backup program that was duplicating the folders I copied.
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