Home | Blog | Software | Reviews and Features | Forum | Help | Donate | About us
topbanner_forum
  *

avatar image

Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
  • August 20, 2017, 12:23 PM
  • Proudly celebrating 10 years online.
  • Donate now to become a lifetime supporting member of the site and get a non-expiring license key for all of our programs.
  • donate

Author Topic: how to find out what's mysteriously eating HD space (file sync)  (Read 1233 times)

brotherS

  • Master of Good Ideas
  • Honorary Member
  • Joined in 2005
  • **
  • Posts: 2,163
    • View Profile
    • Donate to Member
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

  • Supporting Member
  • Joined in 2006
  • **
  • Posts: 8,874
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #1 on: January 23, 2017, 11:17 AM »
Have you run scandisk or some other disk diagnostics?

skwire

  • Global Moderator
  • Joined in 2005
  • *****
  • Posts: 4,801
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #2 on: January 23, 2017, 11:20 AM »
Running a chkdsk sometimes results in it finding the sort of slack space you describe.

wraith808

  • Supporting Member
  • Joined in 2006
  • **
  • Posts: 8,874
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #3 on: January 23, 2017, 01:19 PM »
Running a chkdsk sometimes results in it finding the sort of slack space you describe.

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

MilesAhead

  • Supporting Member
  • Joined in 2009
  • **
  • Posts: 7,505
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #4 on: January 23, 2017, 04:34 PM »
I have two external HDs (same model) and mirror everything from #1 to #2 with a file synchronizer tool

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.

Deozaan

  • Charter Member
  • Joined in 2006
  • ***
  • Points: 1
  • Posts: 7,992
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #5 on: January 23, 2017, 08:14 PM »
You may also be able to use some tool like WinDirStat to see what's taking up space on your drives.

Target

  • Honorary Member
  • Joined in 2006
  • **
  • Posts: 1,630
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #6 on: January 23, 2017, 11:23 PM »
if its only a mirror, then why not just wipe it and re-synch?

if it re-occurs then you know you've got a problem
« Last Edit: January 23, 2017, 11:43 PM by Target »

Stoic Joker

  • Honorary Member
  • Joined in 2008
  • **
  • Posts: 6,352
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #7 on: January 24, 2017, 06:39 AM »
Could File History (fka Previous Versions) be using one of the drives?

brotherS

  • Master of Good Ideas
  • Honorary Member
  • Joined in 2005
  • **
  • Posts: 2,163
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #8 on: January 24, 2017, 08:03 AM »
I tried chkdsk but it didn't show anything not normal.

Yes, those are HDDs.

> if its only a mirror, then why not just wipe it and re-synch?

Because it's >1 TB of data and both drives are connected only by USB 2.0.  :-[

No "File History" in use here.

WinDirStat finally helped me find the issue: a file with a >4 GB size only had a "size on disk" of a few MB on one drive but >4 GB size on the other. So weird! A similar finding with a >1 GB file. Now both drives have the same available disk space again! The file synchronizer might have an issue with larger files, I'll keep an eye on this.

Thanks for all your help!  :-*

MilesAhead

  • Supporting Member
  • Joined in 2009
  • **
  • Posts: 7,505
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #9 on: January 24, 2017, 11:04 AM »
The file synchronizer might have an issue with larger files, I'll keep an eye on this.

That could be it.  I was using a dedicated folder sync program.  It worked fine until it hung one day.  I assume the number of files, or the number of files over a GB, got to be too much for it.  I switched to the folder sync in FreeCommanderXE and so far haven't had an issue with the same folder set.

Deozaan

  • Charter Member
  • Joined in 2006
  • ***
  • Points: 1
  • Posts: 7,992
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #10 on: January 24, 2017, 03:41 PM »
The possibilities that spring to my mind are:

  • Are both HDDs formatted using the same filesystem? (Does that filesystem support large files?)
  • Do you have "Compress this drive to save disk space" enabled on one or both drives?

I recently-ish discovered that enabling drive compression kept causing my source code repositories to become corrupted. The problem plagued me for over a year and I had to keep pulling a fresh copy of my repo from BitBucket because my local copy kept getting corrupted. I even bought a new HDD because I thought the corruption was a sign that my old one was failing. So now, with multi-terabyte drives becoming ubiquitous and relatively inexpensive, I would recommend to keep this option disabled to avoid rare problems like what I experienced.
« Last Edit: January 24, 2017, 03:47 PM by Deozaan »

brotherS

  • Master of Good Ideas
  • Honorary Member
  • Joined in 2005
  • **
  • Posts: 2,163
    • View Profile
    • Donate to Member
Re: how to find out what's mysteriously eating HD space (file sync)
« Reply #11 on: January 25, 2017, 02:35 AM »
@MilesAhead: ah, good to know.

@Deozaan: yes, both are the same. No, never was a fan of that.  8)