Weird issues with ReadyNAS PRO & 3.0TB Drives

ReadyNAS PRO 6 BAY, firmware 4.2.18
Some folders I can read and write 100+ MBps and other folders I can read 100+ MBps but only write 100Kbps-300Kbps per sec.
Also, every time I perform a system restart (without the filesystem check turned on) the system performs a filesystem check anyway.
I'm a little concerned that the filesystem may eventually become corrupt at some point.

Recently upgraded hard drives to (6) 3.0TB Hitachi Drives
Model: Hitachi HUA723030ALA640
Firmware: MKAOA580

Netgear 24 Port Switch : GSM7224

Perfomed online upgrade with each of the drives as stated in directions, pulled one drive and replace with new drive, wait for resync to complete and repeat the process, took 1.5 days to complete upgrade and everything seems to be ok with exception of strange performance and filesystem repairs.

Prior to upgrading the drives I had (6) 1.0TB Western Digital drives installed and had no issues. Performance was consistent and no filesystem errors.

Did not perform a factory reset since I have data on the drives already. Is a factory reset necessary and if I do this will it make a difference/fix the problems?
Here is a clip of one of the filesystem check reports I get emailed to me automatically.

I have MAC OSX 10.6 & 10.7 as well as PCs WINXP and WIN7 accessing the ReadyNAS.

***** File system check performed at Thu Jul 28 10:16:15 EDT 2011 ***** fsck 1.41.14 (22-Dec-2010) e2fsck 1.41.14 (22-Dec-2010) /dev/c/c contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes Inode 20000769 has a bad extended attribute block 2474344576. Clear? yes

Inode 20000769, i_blocks is 24, should be 16. Fix? yes

Inode 36929537 has a bad extended attribute block 3077668992. Clear? yes

Inode 36929537, i_blocks is 24, should be 16. Fix? yes

Inode 53555201 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555201, i_blocks is 24, should be 16. Fix? yes

Inode 53555202 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555202, i_blocks is 16, should be 8. Fix? yes

Inode 53555203 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555203, i_blocks is 80, should be 72. Fix? yes

Inode 53555204 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555204, i_blocks is 16, should be 8. Fix? yes

Inode 53555205 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555205, i_blocks is 16, should be 8. Fix? yes

Inode 53555206 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555206, i_blocks is 16, should be 8. Fix? yes

Inode 53555207 has a bad extended attribute block 2474344576. Clear? yes

Inode 53555207, i_blocks is 16, should be 8. Fix? yes

Inode 62062593 has a bad extended attribute block 3077668992. Clear? yes

Inode 62062593, i_blocks is 24, should be 16. Fix? yes

Inode 62062594 has a bad extended attribute block 3077668992. Clear? yes

Inode 62062594, i_blocks is 16, should be 8. Fix? yes

Inode 62062595 has a bad extended attribute block 3077668992. Clear? yes

Inode 62062595, i_blocks is 16, should be 8. Fix? yes

Inode 62062596 has a bad extended attribute block 3077668992. Clear? yes

Inode 62062596, i_blocks is 16, should be 8. Fix? yes

Inode 112766977 has a bad extended attribute block 3215556736. Clear? yes

Inode 112766977, i_blocks is 24, should be 16. Fix? yes

Inode 146206721 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206721, i_blocks is 24, should be 16. Fix? yes

Inode 146206722 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206722, i_blocks is 80, should be 72. Fix? yes

Inode 146206723 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206723, i_blocks is 16, should be 8. Fix? yes

Inode 146206724 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206724, i_blocks is 16, should be 8. Fix? yes

Inode 146206725 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206725, i_blocks is 16, should be 8. Fix? yes

Inode 146206726 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206726, i_blocks is 8, should be 0. Fix? yes

Inode 146206727 has a bad extended attribute block 3215556736. Clear? yes

Inode 146206727, i_blocks is 16, should be 8. Fix? yes

Inode 221368321 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368321, i_blocks is 24, should be 16. Fix? yes

Inode 221368322 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368322, i_blocks is 16, should be 8. Fix? yes

Inode 221368323 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368323, i_blocks is 80, should be 72. Fix? yes

Inode 221368324 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368324, i_blocks is 16, should be 8. Fix? yes

Inode 221368325 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368325, i_blocks is 16, should be 8. Fix? yes

Inode 221368326 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368326, i_blocks is 16, should be 8. Fix? yes

Inode 221368327 has a bad extended attribute block 2474344576. Clear? yes

Inode 221368327, i_blocks is 16, should be 8. Fix? yes

Inode 280702977 has a bad extended attribute block 3077668992. Clear? yes

Inode 280702977, i_blocks is 24, should be 16. Fix? yes

Inode 297238529 has a bad extended attribute block 3215556736. Clear? yes

Inode 297238529, i_blocks is 24, should be 16. Fix? yes

Inode 302350346 has a bad extended attribute block 2418802816. Clear? yes

Inode 302350346, i_blocks is 48, should be 40. Fix? yes

Inode 309293057 has a bad extended attribute block 2474344576. Clear? yes

Inode 309293057, i_blocks is 24, should be 16. Fix? yes

Inode 317329409 has a bad extended attribute block 2538635392. Clear? yes

Inode 317329409, i_blocks is 40, should be 32. Fix? yes

Inode 342978561 has a bad extended attribute block 2474344576. Clear? yes

Inode 342978561, i_blocks is 80, should be 72. Fix? yes

Inode 342978562 has a bad extended attribute block 2474344576. Clear? yes

Inode 342978562, i_blocks is 16, should be 8. Fix? yes

Inode 342978563 has a bad extended attribute block 2474344576. Clear? yes

Inode 342978563, i_blocks is 16, should be 8. Fix? yes

Inode 342978564 has a bad extended attribute block 2474344576. Clear? yes

Inode 342978564, i_blocks is 16, should be 8. Fix? yes

Inode 342978565 has a bad extended attribute block 2474344576. Clear? yes

Inode 342978565, i_blocks is 16, should be 8. Fix? yes

Inode 350892033 has a bad extended attribute block 2538635392. Clear? yes

Inode 350892033, i_blocks is 40, should be 32. Fix? yes

Inode 384708609 has a bad extended attribute block 3077668992. Clear? yes

Inode 384708609, i_blocks is 40, should be 32. Fix? yes

Inode 401944577 has a bad extended attribute block 3215556736. Clear? yes

Inode 401944577, i_blocks is 24, should be 16. Fix? yes

Inode 418144257 has a bad extended attribute block 3077668992. Clear? yes

Inode 418144257, i_blocks is 24, should be 16. Fix? yes

Inode 418144258 has a bad extended attribute block 3077668992. Clear? yes

Inode 418144258, i_blocks is 80, should be 72. Fix? yes

Inode 418144259 has a bad extended attribute block 3077668992. Clear? yes

Inode 418144259, i_blocks is 16, should be 8. Fix? yes

Inode 418144260 has a bad extended attribute block 3077668992. Clear? yes

Inode 418144260, i_blocks is 16, should be 8. Fix? yes

Inode 435507201 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507201, i_blocks is 24, should be 16. Fix? yes

Inode 435507202 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507202, i_blocks is 80, should be 72. Fix? yes

Inode 435507203 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507203, i_blocks is 16, should be 8. Fix? yes

Inode 435507204 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507204, i_blocks is 16, should be 8. Fix? yes

Inode 435507205 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507205, i_blocks is 16, should be 8. Fix? yes

Inode 435507206 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507206, i_blocks is 8, should be 0. Fix? yes

Inode 435507207 has a bad extended attribute block 3215556736. Clear? yes

Inode 435507207, i_blocks is 16, should be 8. Fix? yes

Inode 451932161 has a bad extended attribute block 3077668992. Clear? yes

Inode 451932161, i_blocks is 24, should be 16. Fix? yes

Inode 451932162 has a bad extended attribute block 3077668992. Clear? yes

Inode 451932162, i_blocks is 80, should be 72. Fix? yes

Inode 451932163 has a bad extended attribute block 3077668992. Clear? yes

Inode 451932163, i_blocks is 16, should be 8. Fix? yes

Inode 451932164 has a bad extended attribute block 3077668992. Clear? yes

Inode 451932164, i_blocks is 16, should be 8. Fix? yes

Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information Block bitmap differences: -2149122176 -(2200174720--2200174736) -2220884096 -2290974848 -2290974865 -2290974875 -2290974892 -2290974899 -2290975015 -2290975082 -2290975094 -2290975111 -2290975132 -2290975225 -2290975234 -2290975253 -2290975286 -2290975292 -2290975297 -2290975302 -2290975319 -2290975327 -2290975330 -2290975338 -2290975347 -2290975359 -2290975369 -2290975378 -2290975385 -(2418802816--2418802817) -2474344576 -2538635392 -2559475840 -2559475850 -2559475860 -2559475867 -2559475874 -2559475889 -2559475902 -2559475917 -(2737307776--2737307777) -3077668992 -3215556736 Fix? yes

Free blocks count wrong for group #65586 (32637, counted=32638).
Fix? yes

Free blocks count wrong for group #67144 (32621, counted=32638).
Fix? yes

Free blocks count wrong for group #67776 (32637, counted=32638).
Fix? yes

Free blocks count wrong for group #69915 (32612, counted=32638).
Fix? yes

Free blocks count wrong for group #73816 (12156, counted=12158).
Fix? yes

Free blocks count wrong for group #75511 (32635, counted=32636).
Fix? yes

Free blocks count wrong for group #77473 (32633, counted=32634).
Fix? yes

Free blocks count wrong for group #78109 (32563, counted=32571).
Fix? yes

Free blocks count wrong for group #83536 (32636, counted=32638).
Fix? yes

Free blocks count wrong for group #93923 (32633, counted=32634).
Fix? yes

Free blocks count wrong for group #98131 (32635, counted=32636).
Fix? yes

Free blocks count wrong (3349818597, counted=3349818658).
Fix? yes


/dev/c/c: ***** FILE SYSTEM WAS MODIFIED *****
/dev/c/c: 323029/457113600 files (7.0% non-contiguous), 307090142/3656908800 blocks