File copy errors on EXT4 SSD but fsck says its clean ????

[linux guy]

# smartctl -l selftest /dev/sdb
smartctl 5.42 2011-10-20 r3458 [i686-linux-3.1.5-1.fc16.i686] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF READ SMART DATA SECTION ===
SMART Self-test log structure revision number 1
Num  Test_Description    Status
Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Reserved (0x20)       Completed without error       00%
 3502         -
# 2  Offline             Completed without error               00%
       3502         -
# 3  Reserved (0x10)     Completed without error         00%
  27         -
# 4  Offline             Completed without error               00%
        27         -


[root at server me]# smartctl -t long /dev/sdb
smartctl 5.42 2011-10-20 r3458 [i686-linux-3.1.5-1.fc16.i686] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF OFFLINE IMMEDIATE AND SELF-TEST SECTION ===
Sending command: "Execute SMART Extended self-test routine immediately
in off-line mode".
Drive command "Execute SMART Extended self-test routine immediately in
off-line mode" successful.
Testing has begun.
Please wait 1 minutes for test to complete.
Test will complete after Fri Dec 16 07:52:13 2011

Use smartctl -X to abort test.
[root at server me]#
[root at server me]#
[root at server me]# smartctl -Hc /dev/sdb
smartctl 5.42 2011-10-20 r3458 [i686-linux-3.1.5-1.fc16.i686] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00) Offline data collection activity
                                        was never started.
                                        Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever
                                        been run.
Total time to complete Offline
data collection:                (    1) seconds.
Offline data collection
capabilities:                    (0x75) SMART execute Offline immediate.
                                        No Auto Offline data collection support.
                                        Abort Offline collection upon new
                                        command.
                                        No Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine
recommended polling time:        (   1) minutes.
Extended self-test routine
recommended polling time:        (   1) minutes.
Conveyance self-test routine
recommended polling time:        (   1) minutes.