Seagate ST2000DL003 3.5" Barracuda Green Hard Drive

Now I'm confused - just went out and bought two brand new WD 2TB drives that are on the HCL (WD20EARX), rebuilt (Factory Default, etc) the ReadyNAS Duo V2 (running arm 5.3.2) - and after copying over about 60Gb of data thought I'd do a Restart with a Volume Scan - Here's what I got back (notification email):

Subject: Volume scan found and corrected errors. (ReadyNAS-Duo)

***** File system check performed at Fri Jan 6 23:21:40 WET 2012 *****
fsck from util-linux-ng 2.17.2
e2fsck 1.41.14 (22-Dec-2010)
Pass 1: Checking inodes, blocks, and sizes
Inode 26152714, i_blocks is 517240, should be 517248. Fix? yes

Inode 26152809, i_blocks is 594336, should be 594344. Fix? yes

Inode 26153281, i_blocks is 691104, should be 691112. Fix? yes

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

/dev/mapper/c-c: ***** FILE SYSTEM WAS MODIFIED *****
/dev/mapper/c-c: 9267/30285824 files (1.3% non-contiguous), 13998799/484573184 blocks

Is this something to be worried about, or am I just being paranoid???