Size on my internal drive and external hard drive

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23 Jun 2015
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Hello,

I was wondering if someone can be kind enough to help me work a small problem out.

I have an internal hard that's 29.1TB in capacity. It's been filled and there is 938GB remaining.

I also have my stuff backed up on 3 external hard drives (Seagate) making up the size overall size (6TB, 8TB and 18TB). The space remaining across the 3 drives is 933.8GB.

There is a discrepancy of 4.2GB. I'm not the one who likes wasting space because all these drives were expensive. I've checked internal and external drives for any duplicate files, I've run duplicate apps to check this and it came with nothing.

I checked if there were the same number of files on both the internal and external hard drives, there is, but I discovered much of this were tiny hidden files.

A friend of mine suggested, the external hard drives may have used up more space to store all my data because the way it writes data is different to an SSD. What do you guys think? Does this sound plausible? Or do you have any ideas how I can trace this menace of a file down?

Thank you for your time.
 
Last edited:
Ignoring drive size for the moment
Usually when there's a discrepancy in my backups
System restore may be turned on with one drive but not on
The other drives
Recycle bin size may differ/not been emptied on one drive
Or if I am comparing C drive to others
Hibernate may be turned on on C drive
Or show hidden/operating system files is disabled
I use a mixture of windirstat
And foldersize software to spot the difference
Foldersize has the advantage of showing recycle folder

Pretty sure a HDD and a SSD the file size will be identical
Cant think why it wouldn't be
Though been years since I actually used spinning hard drives

Though I assume you are measuring the actual size
Of the data on each drive?
Is the amount of data identical?
Not the amount of free space?
As then it could differ depending on the drives used I guess
Some pictures might help showing what you are seeing
And how you're comparing things
 
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