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how to find out what's mysteriously eating HD space (file sync)

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brotherS:
Hello,

I have two external HDs (same model) and mirror everything from #1 to #2 with a file synchronizer tool every now and then. But Windows Explorer now tells me that there are about 5.8 GB more on #2. Huh?  :huh:

I then used Beyond Compare to compare both drives, but wasn't able to find the difference. Everything looks the same.

What can cause this? I never saw this in the past.

wraith808:
Have you run scandisk or some other disk diagnostics?

skwire:
Running a chkdsk sometimes results in it finding the sort of slack space you describe.

wraith808:
Running a chkdsk sometimes results in it finding the sort of slack space you describe.
-skwire (January 23, 2017, 11:20 AM)
--- End quote ---

Yeah, that's what I meant when I said scandisk  ;D

MilesAhead:
I have two external HDs (same model) and mirror everything from #1 to #2 with a file synchronizer tool
-brotherS (January 23, 2017, 10:38 AM)
--- End quote ---

Just to be sure, I take it these two drives are spinners?  I know sometimes SSDs will show deleted files as unavailable until the memory can  be "reconditioned" or whatever they call it, so that writes are fast again in those areas.

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