Hello... I am having a problem with my TSSTcorp CD-RW/DVD-ROM TSL462D. The error below is causing a parallel application to fail. Here is the relevant output of my system log (dmesg command) ata5.00: ATAPI: TSSTcorpCD-RW/DVD-ROM TSL462D, DE01, max UDMA/33 ... ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen ata5.00: cmd a0/00:00:00:00:20/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0 res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x3 (HSM violation) ata5: soft resetting port ata5.00: configured for UDMA/33 ata5: EH pending after completion, repeating EH (cnt=4) ata5: EH complete ata5.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen ata5.00: cmd a0/00:00:00:00:20/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0 res 51/20:03:00:00:00/00:00:00:00:00/a0 Emask 0x3 (HSM violation) ata5: soft resetting port ata5.00: configured for UDMA/33 ata5: EH pending after completion, repeating EH (cnt=4) ata5: EH complete I have noticed that when i run a parallel MPI application with more than one thread per node, the problem is triggered... I also have noticed that the prompt above comes from the HAL daemon because when i disable the hal daemon, this is not prompted anymore but the problem persists. Using the acpi=off kernel option, the system tends to be more stable but the problem does not solve... Here is my system info (uname -a): [waldyd@nodo5 ~]$ uname -a Linux nodo5.gialea 2.6.23.14 #1 SMP Mon Feb 4 16:12:24 COT 2008 x86_64 x86_64 x86_64 GNU/Linux Any ideas about why is this happening? How can i solve this? Best regards, Nestor Waldyd -- Nestor Waldyd Alvarez Villa | Ingeniero Investigador | Grupo de Investigaciones Ambientales (GIA) Universidad Pontificia Bolivariana | Circular 1 No. 70-01, Bloque 8. Piso 2. | Medellín, COLOMBIA Tel: (57) (4) 4159015 Ext. 9841 | (57) (4) 415 90 84 | Fax: (57) (4) 4159082 mailto:nestor.alvarez@upb.edu.co | www.upb.edu.co | http://convena.upb.edu.co/~gialea/