C:\Windows\system32>smartctl -l selftest sdb
smartctl 5.40 2010-10-16 r3189 [i686-w64-mingw32-win7-sp1] (sf-win32-5.40-1)
Copyright (C) 2002-10 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  Extended offline    Completed: read failure       90%      7835         479079
# 2  Extended offline    Completed without error       00%      7178         -


C:\Windows\system32>smartctl -H sdb
smartctl 5.40 2010-10-16 r3189 [i686-w64-mingw32-win7-sp1] (sf-win32-5.40-1)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

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

BMDMA stat 0x25
failed command: READ DMA
..
..
status: {DRDY ERR}
error: {UNC}