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2Tb Of "data" On A 500Gb Drive?

Last response: in Storage
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July 31, 2010 5:41:35 PM

I am copying data from drives that were on an "old" Windows Home Server (WHS) over to a "new WHS". I can go into details if necessary, but I was having problems with the "old" WHS.

On one drive, it was supposed to be the original system drive, I am very confused because one folder of data is supposedly 2TB in size, however the entire drive is only 500 GB.

I am trying to understand what is going on before I copy these files in case there is something wrong with the data and I wonder if it could be related to what was wrong with the "old" WHS.

Any ideas?

More about : 2tb data 500gb drive

a c 415 G Storage
July 31, 2010 6:55:02 PM

NTFS supports compressed folders - if your drive uses them and if the files in those folders are easily compressible then it's quite possible you could fit 2TB of logical data on a 500GB drive.

Compressed folders are usually shown in a different colour. This is controlled by the folder options dialogue box - select the "View" tab and scroll to near the end of the list to make sure that the "Show encrypted or compressed NTFS files in color" option is checked.

NTFS also supports "sparse" files - these are files that have unused space in them which is not actually allocated until its needed. For example a database could potentially be preallocated to a certain size, yet have thousands of uninitialized rows of data which wouldn't take up any actual space on the disk until they were written to. I'm not sure if a sparse file can have an allocated space larger than the disk itself, but if it can then this could be another explanation.
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July 31, 2010 9:10:46 PM

Thanks. The option to show encrypted or compressed NTFS files in color is already turned on, but these folders do not look any different.

Oh, and I don't know why I didn't try this before, but I cannot open any of the files on this drive either. Says things like, "The file cannot be accessed by the system".
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a c 415 G Storage
July 31, 2010 10:39:30 PM

You may have corruption in your file system - you might want to try running ChkDsk to see what it reports.
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August 1, 2010 2:46:18 AM

I ran scan disk btw. No problems.

However, I totallly figured out my problem.

On the system drive in WHS, there is a D:\Shares folder and a D:\DE\Shares folder.

For all the other drives, there is only the D:\DE\Shares folder.

I was getting confused and jumping straight to the first "shares" folder I saw (in the root directory). This has tombstones to all files that was on that system and hence, no data there, but apparently still lists the size of the original entire WHS system (and hence the 2+ TB of data).

Hope that realization helps someone else.
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a c 415 G Storage
August 1, 2010 4:30:33 AM

Interesting - thanks for posting the resolution to your problem!
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