All, I found the task file call in libata-scsi.c in kernel 2.6.33. TRIM seem to be a SCSI to ATA translation of "WRITE SAME 16". Under what conditions would "WRITE SAME 16" be called? (I am not as familiar with SCSI as I am with ATA). Thanks, Bill -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ