From: Nux! <nux at li.nux.ro> > As far as I know both Centos 5 and 6 support TRIM ("discard" option in > fstab), but only for EXT4 filesystems (and probably XFS). I do not think CentOS 5 supports TRIM (unless back-ported from 2.6.33)... http://kernelnewbies.org/Linux_2_6_33#head-b9b8a40358aaef60a61fcf12e9055900709a1cfb JD