HDD unmounts while file are being copied

[kaladont]

Only HDD1 -> UUID=9C64D17064D14DA0

/dev/sdc1 466G 317G 150G 68% /home/xbian/HDD1
/dev/sdd1 466G 317G 150G 68% /home/xbian/HDD1
/dev/sde1 466G 317G 150G 68% /home/xbian/HDD1

I have read about "ntfs_attr_pread_i: ntfs_pread failed: Input/output error" People suggested to run chkdsk /R on windows.

I did check with ntfsfix but it did not show anything.

Code:

xbian@xbian ~ $ sudo ntfsfix /dev/sdb1
Mounting volume... OK
Processing of $MFT and $MFTMirr completed successfully.
Checking the alternate boot sector... OK
NTFS volume version is 3.1.
NTFS partition /dev/sdb1 was processed successfully.