My J: drive is an network file store. I ran out of quota space copying to it from my 2008 R2 64-bit VM and, after removing the partial copy, checked the drive space. Here is what was reported. D:\free j: Volume in drive J is Transfer Serial number is ... 2,147,483,648 bytes total disk space -70,969,159,680 bytes used 73,116,643,328 bytes free -3304.8 % in use D:\>ver /r TCC LE 13.03.39 x64 Windows 2008 [Version 6.0.6001] TCC LE Build 39 Windows 2008 Build 6001 Service Pack 1 That was checked from the VM. Just in case the error was version specific, I also checked from my Win7 laptop. D:\>free j: Volume in drive J is Transfer Serial number is ... 2,147,483,648 bytes total disk space -70,969,163,776 bytes used 73,116,647,424 bytes free -3304.8 % in use D:\>ver /r TCC 13.03.39 Windows 7 [Version 6.1.7600] TCC Build 39 Windows 7 Build 7600 Volume data as reported by Windows Explorer properties: Type: Network Drive File system: NTFS Used: 19.6GB (21,091,037,184 bytes) Free: 19.4GB (20,851,998,720 bytes) Capacity: 39.0GB (41,943,035,904 bytes) The free command appears to be using max_long + 1 for this drive size.