I have some bad blocks on 2 of 6 drives in my ZFS raidz2. Is there a way to fix them without formatting the drives? If not, will formatting fix them? Some details: I'm running FreeNAS-8.0.2-RELEASE-amd64 (8288) The drives are Samsung HD204UI (the drives were manufactured after the firmware issue that is well documented on the forum, and I applied the firmware patch anyway, just to be sure) Here is the smartctl output for 1 of the drives (output for the other drive is pretty much the same, just different LBA_of_first_error): Code (text): smartctl -l selftest /dev/ada0 smartctl 5.41 2011-06-09 r3365 [FreeBSD 8.2-RELEASE-p3 amd64] (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 Short offline Completed: read failure 90% 3741 1192616706 # 2 Short offline Completed: read failure 90% 3732 1192616706 # 3 Short offline Completed: read failure 90% 3407 1192616706 # 4 Extended offline Completed: read failure 70% 299 1192616706 # 5 Short offline Completed: read failure 90% 297 1192616706 # 6 Short offline Completed without error 00% 33 - I've read through this tutorial but it's geared towards Linux, and the sg3_utils mentioned are not available in FreeNAS. Any help here would be greatly appreciated.