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I have several disk partitions, i made then each 250gb. I used robocopy to copy one partition to another I got an error the destination disk is out of space. wtf they are the same size.

I right clicked my Q partition and I see 250gb, thats correct. My destination is 250gb. I jammed all my files into a folder called a so i dont have to worry about recylebin being copied by robocopy (i ran robocopy with admin permissions). So i right clicked and i see my a folder has more data then my partition can hold.

My first thought is compression weirdness. My destination is also NTFS so i'm not sure why it wouldnt have the same files compressed. I can't tell which files are compressed. Whats going on here? Is my source corrupted? If not how do i copy it to my other partition?

Note: the source doesn't appear to be compressed and no files in any folder is has blue filenames (which means its compressed by the disk/os/ntfs). So i'm not sure how its doing this

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Your a folder is bigger than your Q disk, so the files won't fit. The total size of all directory entries on a disk can be larger than the physical size of the disk for many reasons -- one common one is if the same file has more than one directory entry. On the source, it's just one file, but when you copy it, each directory entry will wind up being its own file with its own copy of the data. – David Schwartz Nov 18 '12 at 8:37
@DavidSchwartz I'm positive I don't have any soft or hardlinks on the source. Do you know a way to find them? I'll run a duplicate check on the source partition – acidzombie24 Nov 18 '12 at 8:44
Hard links and compressed files have already been mentioned. Sparse files can cause this as well. – MJZ Dec 4 '12 at 19:42
@DavidSchwartz: If you make it an answer i'll accept. – acidzombie24 Dec 5 '12 at 17:39
@MJZ: +1. Would that make total blocks used on disk smaller? I'm not sure if that will make total size on disk exceed what the disk can hold. But that explains why I can hold more on an NTFS usb stick then FAT. I forgot about those – acidzombie24 Dec 5 '12 at 17:42

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