Newer HDD and USB Hard drives are migrating from the use of a physical format of having 512-byte sectors to that of having 4096-byte sectors (known as 4K or 4 KB sectors). Not all Microsoft operating systems support the 4K format.
This change will cause failures when these drives are being backed up, because the drives can not be accessed properly.
How to determine which drive format is being used:
In a command line with administrator privileges, run the following command (replacing the <drive> with the drive letter and colon) :
fsutil fsinfo ntfsinfo <drive>
Example: fsutil fsinfo ntfsinfo c:
The Output will look similar to the results below:
The circled item shows the native sector count. 4096 = 4K
The larger sector size disks are presently supported only in Windows Server 2012 and Windows 8. If this type of Drive is being used by a Microsoft OS other then Server 2012 or Windows 8, Volume Shadow Copy Service (VSS) issues can occur.
Microsoft Support article http://support.microsoft.com/kb/2510009
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