There are two bugs in the 0.52 that this release fix
- The ataidle tools is not used when the ATA parameter are to default (this tools can create some problems)
- Fix the size of USB drive.

For the files:
http://sourceforge.net/project/showfiles.php?group_id=151951

If you had installed FreeNAS on hard drive/CF/USB, you can use the system/firmware for upgrade it (by using the .img file).

--
Olivier Cochard
FreeNAS main developer
http://www.freenas.org
Skype: callto://ocochard