Backup from C: not the same size on external J:

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nubie76

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Not sure why a common practice has gone sideways. For years I simply backup a large folder including organized documents, music, and pictures to an external Seagate expansion drive (J:) using drag and drop in windows explorer. I always review properties after backing up to make sure that the file sizes are the same. Last June I purchased a 2nd external Seagate expansion drive (K:) that will be kept offsite and have made four back ups on it since then. I made a back up on the J: no problem and then on the K: which turned out to be 87 GB. My folder on the C: is 121 GB. After some googling I downloaded a SeaTools for Windows and received a not less or equal stop code twice. Then I purchased EaseUS Todo software and performed the same back up from the C: to the K: and got the 87GB again, then on the J: as well. Then tried a back up from the Windows 10 settings to the K: and got 120GB.
All drives have loads of space left, J: is 3TB and K: is 5TB. This has always been a pretty simple process, so I am assuming there is something about Windows 10 which is different. Computer is barely 3 years old and I think it was upgraded to 10 in the first quarter. If someone could please point me in the right direction I would be very grateful.
 
Joined
Sep 21, 2007
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Could be a difference in how the drive was formatted originally. NTFS allows you to change sector sizes when formatting. So one drive could have been formatted with a smaller sector size, which would result in less space taken up when storing small files like documents.
 

nubie76

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Nov 26, 2018
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This is from the Seagate website:
"Your Backup Plus Desktop is formatted as NTFS for compatibility with Windows out of the box. Therfore, you can connect Backup Plus Desktop to a Windows PC without formatting the hard drive."
I have no knowledge of partitions or sector size so I have never modified the hard drive. How would I determine the sector size of a hard drive?
 
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Actually, I quess that difference caused by sector size would not account for several GB's difference. You can see what I am talking about when you right click on a folder and choose Properties.
There is a Size measurement and Size on Disk measurement.
 

nubie76

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Nov 26, 2018
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Finally changed my google search to "windows file properties" and found that this is a known problem with Windows 10 version 1803. It prevents the correct file size from being shown consistently. There seems to be some questions as to path size causing it, but its basically another Microsoft glitch which now prevents people from even seeing the correct size of their available hard drive disk space. You wouldnt notice it unless you were doing a backup and comparing file size afterwards. Users are using treesizefree to be able to read the correct size of a file. Apparently Microsoft has not been able to fix it yet. I have wasted hours of time thinking my seagate was not backing up correctly.
 
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